Extramammary Paget disease is a rare skin cancer that usually affects areas with many sweat glands, such as the vulva, scrotum, penis, groin, or around the anus. It often causes a long-lasting itchy, red, scaly, or sore patch, so the early symptoms of extramammary Paget disease can look like eczema or a rash that does not go away. Many people living with extramammary Paget disease are older adults, and the condition is often slow growing, but not everyone will have the same experience. Treatment usually involves surgery, and some people may also need creams, laser treatment, radiation, or treatment for a related cancer if one is found. Most cases are not immediately life-threatening when caught early, but the outlook depends on whether extramammary Paget disease stays in the skin or has spread.
How many people live with Extramammary paget disease?
Worldwide, major rare-disease sources such as Orphanet describe extramammary Paget disease as very rare, but they do not provide one consistent current estimate of how many people are living with it (Orphanet, 2024). The same is true in the United States, where population-based sources such as the National Cancer Institute’s SEER program report new cases more often than a current national total of people living with the disease (National Cancer Institute SEER, 2024).
Overview
Extramammary paget diseaseSymptoms
Extramammary Paget disease often causes a slow-growing, itchy, red, scaly rash in skin folds such as the genital, anal, or underarm area. Many also notice burning, soreness, crusting, or skin that looks like eczema but does not improve.
Outlook and prognosis
Extramammary Paget disease often grows slowly, and many people do well when it is found early and fully treated. Outlook depends mainly on whether it stays in the skin or has spread deeper, which can raise the chance of recurrence.
Causes and risk factors
Extramammary Paget disease usually has no clear single cause. Risk is higher in older adults, and some cases are linked to nearby skin-gland cancers or, less often, internal cancers. Inherited risk, lifestyle, and environmental triggers are not clearly proven.
Genetic influences
Genetics are not a major driver in most cases of Extramammary Paget disease. Most people with Extramammary Paget disease do not inherit it. Genetic changes can be found in tumor cells, but these are usually acquired during life rather than passed down in families.
Diagnosis
Extramammary Paget disease is usually diagnosed by examining the skin and confirming it with a biopsy. The diagnosis of Extramammary Paget disease may also include special lab staining and, in some cases, imaging or tests to check for spread or related cancers.
Treatment and drugs
Treatment for extramammary Paget disease often starts with surgery to remove the affected skin. Some people also need creams, laser treatment, radiation, or care for an underlying nearby cancer, depending on how far the disease has spread.
Symptoms
Extramammary Paget disease often affects skin in the genital area, groin, around the anus, or sometimes the underarm, where it can interfere with comfort, walking, sex, or daily hygiene. It is easy to mistake for eczema, a yeast infection, or simple skin irritation, so the early symptoms of extramammary Paget disease are often missed. You might notice small changes at first, with itching, a persistent rash, or soreness that keeps returning in the same spot. The exact pattern can differ, but symptoms usually do not go away fully with standard skin creams.
Itching is often the most noticeable symptom and may start as a mild, stubborn itch in one small area. Many people with extramammary Paget disease notice that the itch keeps coming back in the same spot despite anti-itch, steroid, or antifungal creams.
A patch of skin may stay red, pink, scaly, or irritated for weeks to months, often on the vulva, scrotum, penis, groin, around the anus, or underarm. On darker skin, the area may look darker, lighter, or simply different from nearby skin instead of bright red.
The area can sting, burn, feel tender, or seem raw, especially with sweating, walking, sex, or using the bathroom. Everyday things like tight underwear or wiping can become uncomfortable.
The skin may ooze, weep, or form crusts that leave moisture or stains on underwear. Some people with extramammary Paget disease also notice a sticky feeling or a patch that never seems fully dry.
How people usually first notice Extramammary paget disease?
Extramammary Paget disease is often first noticed as a patch of skin that stays red, scaly, itchy, sore, or irritated in areas such as the vulva, scrotum, penis, groin, around the anus, or the armpit, and it can look so much like eczema or a rash that people live with it for months before it is taken seriously. Some people with extramammary Paget disease also notice burning, tenderness, bleeding, oozing, or a thickened area of skin that does not heal despite creams or routine skin treatments. Because the first signs of extramammary Paget disease can be subtle and easy to mistake for common skin problems, a rash in one of these areas that keeps coming back or does not improve should be checked by a clinician.
Types of Extramammary paget disease
Extramammary Paget disease can show up in a few recognized forms, and the type often affects how doctors look for the source of the disease and how symptoms may behave. Researchers describe these categories to better understand patterns of the condition. The main types of Extramammary Paget disease are primary disease that starts in the skin, secondary disease linked to another nearby or internal cancer, and tumors that are either limited to the top layer of skin or have grown deeper. For many living with Extramammary Paget disease, early symptoms of Extramammary Paget disease can look similar across types, such as an itchy, red, scaly patch that keeps coming back.
Primary EMPD
This type starts in the skin itself, usually in areas rich in sweat glands such as the vulva, scrotum, penis, perianal area, or underarm. It often causes a stubborn rash, burning, itching, soreness, or skin that looks raw and does not fully heal. In many cases it stays local at first, although some tumors can grow deeper over time.
Secondary EMPD
This type happens when Paget cells in the skin are linked to another cancer underneath or nearby, such as in the bladder, rectum, anus, cervix, prostate, or urethra. The skin changes can look much like primary Extramammary Paget disease, but some people also have symptoms from the related cancer, such as bleeding, pain with urination, or bowel changes. Finding this type usually means doctors need a broader search for the source.
In situ
In this form, the abnormal cells are limited to the top layer of the skin and have not grown into deeper tissue. Symptoms are often mainly skin-based, with itching, irritation, flaking, or a patch that can resemble eczema. Even within the same type, intensity can range from mild to severe.
Invasive EMPD
In this form, the disease has grown below the top layer of skin into deeper tissue. Along with the usual rash-like changes, some may notice a thicker area, a lump, ulceration, bleeding, or more persistent pain. This type may be more serious because it has a higher chance of spreading to nearby lymph nodes or beyond.
Can I slow down the onset of symptoms?
No—right now, there is no good evidence that lifestyle changes, diet, exercise, or medicines can meaningfully delay the start of symptoms of extramammary Paget disease. Research on prevention is very limited because this is a rare skin cancer, and the most helpful step is to get checked promptly if you have lasting itching, burning, soreness, or a rash around the genital or anal area, since an early skin exam and, if needed, a small skin sample test can lead to earlier treatment. That cannot prevent the disease from starting, but it can help people with extramammary Paget disease get answers sooner and may improve treatment choices.
What genetics can tell you about symptoms
For extramammary Paget disease, genetics can show that the abnormal skin cells sometimes carry changes in certain cancer-related genes, but these findings do not usually let doctors predict exactly which symptoms someone will have. In most people, symptoms such as itching, burning, soreness, or a rash-like patch are shaped more by where the disease is, how much skin is involved, and whether it has grown deeper, rather than by a specific inherited gene change. Genetic testing may still help in some cases because it can give clues about how the disease behaves and whether targeted treatment might help, but it is not a reliable way to forecast when symptoms will start or how severe they will be.
Causes and risk factors
A long-lasting rash in the genital, anal, or underarm area can sometimes come from cell changes that lead to extramammary Paget disease. The exact cause is often unclear, but the main risk factors for extramammary Paget disease are older age and, in some cases, a cancer in nearby skin glands or organs such as the bladder, rectum, cervix, or prostate. Family history is not a major cause for most people, and inherited gene changes have not been clearly linked in most cases. Researchers are still learning how these pieces fit together. No clear lifestyle or environmental cause has been proven, so smoking, diet, or hygiene are not known to be main drivers.
What are the most common causes or risk factors?
The exact cause of extramammary Paget disease is often not clear, but it is most common in older adults, usually after age 50, and it tends to affect skin in the genital, anal, or underarm area. In many living with this condition, the cancer starts in the top layer of the skin, but in some it is linked to a nearby cancer in places such as the bladder, bowel, prostate, or cervix. It is not usually passed down in families, so a strong inherited genetic risk has not been clearly shown.
Environmental and biological risk factors
Extramammary Paget disease is rare, and the main risk factors for extramammary Paget disease are not as well defined as they are for many other cancers. Doctors often group risks into internal (biological) and external (environmental). What stands out most is older age, certain body sites, and in some cases a nearby underlying cancer. For many people, there is no clear outside trigger.
Extramammary Paget disease is diagnosed most often in older adults, usually after age 50. The risk rises with age, likely because abnormal cell changes can build up slowly over many years.
This disease usually starts in skin with many specialized sweat glands, such as the vulva, scrotum, penis, around the anus, groin, or armpit. Those areas seem more vulnerable because the abnormal cells often arise in or near gland-bearing skin.
Risk patterns differ by body site and region. Vulvar extramammary Paget disease is seen more often in women in the US and Europe, while penoscrotal disease is reported more often in men in parts of Asia.
Some cases are linked to a nearby cancer in tissues such as the urinary tract, bowel, or anorectal area. When that happens, cancer cells can spread into the top layer of the skin and create secondary extramammary Paget disease.
Genetic risk factors
Most people with extramammary Paget disease do not have a known inherited cause. In many cases, the important DNA changes seem to develop in the affected skin cells themselves, rather than being passed down through a family. The main genetic risk factors for extramammary Paget disease that researchers have identified involve genes that control cell growth, especially HER2, PIK3CA, and TP53. Carrying a genetic change doesn't guarantee the condition will appear.
No clear inheritance: A strong family-based inheritance pattern has not been proven for most cases of extramammary Paget disease. For many, the gene changes are thought to start only in the diseased skin cells, so relatives usually do not face a clearly defined inherited risk.
HER2 changes: Changes in the HER2 gene are among the best-known genetic findings in extramammary Paget disease. They can keep growth signals switched on, which may help abnormal skin cells survive and multiply.
PIK3CA changes: Mutations in the PIK3CA gene can overactivate a pathway that tells cells to grow and divide. Some extramammary Paget disease tumors carry this change, suggesting it helps drive the disease in part of cases.
TP53 changes: The TP53 gene normally helps damaged cells stop dividing or die off. When TP53 is altered, that protection can weaken, making it easier for abnormal cells to build up.
Lifestyle risk factors
For extramammary Paget disease, clear lifestyle causes are not as well established as they are for many other cancers. Still, daily habits can affect skin irritation in the involved area, recovery after treatment, and how quickly persistent symptoms are checked. When people ask about lifestyle risk factors for extramammary Paget disease, the main modifiable issues are habits that can worsen symptoms or complicate care rather than one proven lifestyle trigger.
Smoking is not a proven direct cause of extramammary Paget disease, but it can reduce blood flow and slow wound healing after biopsy or surgery. It may also raise the risk of other cancers that sometimes need to be ruled out in people with this condition.
Higher body weight can increase skin folds, moisture, and friction in the genital, anal, or underarm regions where extramammary Paget disease often appears. This can worsen itching, soreness, and skin breakdown, and it may make treatment and healing more difficult.
Too little physical activity can contribute to weight gain and poorer overall fitness, which may complicate surgery and recovery. Regular movement also helps support circulation and metabolic health during treatment.
Heavy alcohol use can worsen nutritional status and may impair healing after procedures used to diagnose or treat extramammary Paget disease. It can also make it harder to keep up with symptom monitoring, appointments, and recovery plans.
Risk prevention
Extramammary Paget disease is rare, and there is no proven way to fully prevent it because its exact cause is not well understood. In daily life, prevention is mostly about lowering cancer risk where possible and not ignoring a stubborn rash, itching, burning, or skin change in the genital or anal area. Prevention is about lowering risk, not eliminating it completely.
A rash or patch in the vulva, penis, scrotum, groin, or around the anus that does not clear up should be checked promptly. Early symptoms of extramammary Paget disease can look like eczema or a yeast infection, so delays are common.
If itching, soreness, bleeding, or oozing keeps coming back despite creams or antifungal treatment, ask for a clinician to re-examine the area. A skin biopsy is often needed to tell whether extramammary Paget disease is present.
Extramammary Paget disease can sometimes occur alongside cancers in nearby organs, depending on where it appears on the skin. Keeping up with age-appropriate cancer screening and any tests your doctor recommends may help find related problems earlier.
Risk tends to be higher in older adults, and some people with a personal history of certain cancers may need closer follow-up. If you have persistent symptoms or a past cancer diagnosis, tell your doctor so the right evaluation is not delayed.
Can you prevent Extramammary paget disease?
No, there is no known way to fully prevent extramammary Paget disease, a rare skin cancer that usually affects the genital or bottom area, and most people who develop it did nothing to cause it. Because its exact cause is still unclear and it often shows up in skin not exposed to the sun, the usual skin cancer prevention steps have not been proven to prevent it. The most helpful step is not true prevention but early attention to a rash, itching, soreness, or skin change that does not go away, so it can be checked sooner.
Transmission
Extramammary Paget disease is not infectious, so it cannot be passed from one person to another. Many people ask whether Extramammary Paget disease is contagious, but the answer is no: you cannot catch it through skin contact, sexual activity, shared towels, or toilet seats.
Extramammary Paget disease is a rare skin cancer, not an infection, and most cases happen sporadically rather than being inherited within families. If you or someone close to you has it, there is no risk of spreading it to partners, children, or other household members through everyday contact.
When to test your genes
For extramammary Paget disease, routine inherited gene testing is not usually part of early detection. Genetic testing may matter if the disease is advanced, recurrent, or has spread, because testing the tumor itself can sometimes uncover treatment targets; inherited testing may be considered if you also have a strong family history of cancer.
Diagnosis
Extramammary Paget disease is often first investigated when a patch of skin stays red, itchy, sore, or scaly for weeks to months and does not improve with usual creams. Because it can look like eczema, dermatitis, or a fungal rash, the diagnosis of Extramammary Paget disease is often confirmed with a skin sample rather than appearance alone. It’s natural to worry when symptoms don’t have a clear explanation.
Doctors usually begin with a close look at the affected skin and ask how long the area has been itchy, burning, bleeding, or changing. They also check whether the patch has spread beyond the visible edges or involves nearby areas such as the vulva, scrotum, penis, groin, or around the anus.
A small sample of skin is removed and examined under a microscope to confirm the diagnosis. This is the key test because Extramammary Paget disease can closely mimic common rashes, and the biopsy shows the abnormal Paget cells in the top layer of skin.
Special lab tests on the biopsy sample help confirm that the abnormal cells fit Extramammary Paget disease and not another skin disorder. These stains can also help doctors judge whether the disease started in the skin or may be linked to a cancer elsewhere.
If the affected area is large or has unclear borders, doctors may take several small samples from nearby skin. This helps show how far the disease extends, including areas that may look nearly normal to the eye.
How is Extramammary paget disease diagnosed?
Extramammary Paget disease is usually diagnosed after a doctor examines the skin and takes a small skin sample, called a biopsy, to look at under a microscope, since it can look a lot like eczema, a rash, or an infection at first. Special lab stains may also be used on the biopsy to confirm the diagnosis and help tell it apart from other skin problems. Once it is found, many living with this condition also have more tests based on where the patch is on the body to check whether it has spread or whether there is a related cancer nearby, and genetic testing is not usually part of the standard diagnosis.
Stages of Extramammary paget disease
Extramammary Paget disease does not have defined progression stages. This is because it is usually described by how far the abnormal cells have spread in the skin or whether they have become invasive, rather than by a clear step-by-step pattern over time. Doctors usually start with a conversation about skin changes such as a long-lasting itchy, red, sore, or flaky patch, which can resemble early symptoms of Extramammary Paget disease but also overlap with eczema or other common skin problems. Diagnosis and follow-up usually rely on a skin exam, a small skin sample called a biopsy, and sometimes imaging or other tests to check whether deeper tissue or nearby organs are involved.
Outlook and prognosis
Outlook for extramammary Paget disease is often favorable when it is confined to the epidermis and treated effectively, but recurrence is common, so long-term follow-up is important. Prognosis is worse when the disease is invasive, involves lymph nodes, or is associated with an underlying internal malignancy. Local control can be difficult because the visible rash may underestimate the true extent of disease, which contributes to repeated relapses even after surgery. Mortality is generally low for noninvasive cases, but advanced or metastatic extramammary Paget disease can be life-threatening and carries a significantly poorer survival rate. Regular surveillance helps detect recurrence early and can improve outcomes over time.
Long-term effects
For many people, the long-term picture with Extramammary Paget disease depends most on whether it stays limited to the top layer of skin or grows deeper. Many living with Extramammary Paget disease deal with a condition that can come back in the same area, sometimes years after treatment, so the outlook is often measured over time rather than in weeks or months. In medical terms, these are sometimes called late effects or chronic symptoms. When the disease is found early and remains superficial, long-term outcomes are often good, but deeper or more widespread disease can have a more serious outlook.
Extramammary Paget disease often returns in the same patch of skin because the abnormal cells can extend beyond what is easy to see. This means a rash, itching, burning, or soreness may come back even after surgery or other treatment.
Some people are left with long-term irritation, tenderness, color change, or fragile skin in the treated area. Scarring can also affect comfort during walking, sitting, washing, or sexual activity, depending on where Extramammary Paget disease developed.
If Extramammary Paget disease grows down into deeper tissue, the chance of lasting complications and a more serious prognosis rises. Invasive disease is also more likely to spread than disease confined to the surface skin.
In some people, cancer cells travel to nearby lymph nodes, especially when the disease is invasive. This can lower the chances of long-term control and may lead to swelling, discomfort, or the need for more extensive treatment.
How is it to live with Extramammary paget disease?
Living with extramammary Paget disease often means dealing with persistent, intimate-area skin symptoms such as itching, burning, soreness, or skin that stays irritated even after creams and treatments, which can make walking, sitting, exercise, sleep, and sex feel uncomfortable or stressful. Because it can come back after treatment and often needs repeated skin checks, biopsies, surgery, or careful wound care, many people find that daily life starts to revolve around appointments, healing time, and the emotional strain of uncertainty. For partners, family, and caregivers, the condition can also affect routines, intimacy, and emotional well-being, but clear communication and ongoing follow-up care can help people feel more in control.
Treatment and drugs
Extramammary Paget disease is usually treated based on how deep it goes, how large an area it affects, and whether it has spread, but for many people the main treatment is surgery to remove the diseased skin while saving as much healthy tissue as possible. In some cases, especially when the area is hard to treat or surgery is not the best fit, doctors may use radiation or creams placed on the skin, and finding the right therapy can take some time. If Extramammary Paget disease has grown deeper or spread to other parts of the body, treatment may include drug therapy such as chemotherapy, targeted treatment, or immunotherapy, depending on the tumor’s features. Because Extramammary Paget disease can come back after treatment, regular follow-up visits and skin checks are an important part of care.
Can you cure Extramammary paget disease?
Extramammary Paget disease can sometimes be cured, especially when it is found early and removed completely with surgery. Even after treatment, it can come back in the same area, so regular follow-up is important. If it has spread deeper into the skin or to other parts of the body, treatment may not cure it, but it can help control the disease and ease symptoms.
Non-drug treatment
Treatment for extramammary Paget disease often centers on removing or controlling the affected skin while protecting comfort and daily function. For many, treatment begins not at the pharmacy, but with procedures such as surgery or radiation, plus careful follow-up because this condition can come back after treatment. The best plan depends on where the disease is, how wide an area it covers, and whether deeper tissues are involved. If you are looking into treatment options for extramammary Paget disease, it helps to know that care usually combines local treatment with long-term skin checks.
Surgery is the main non-drug treatment for many people with extramammary Paget disease. The goal is to remove the diseased skin with a clear border, but this can be challenging because the abnormal cells may spread beyond what is visible.
Mohs surgery removes thin layers of skin step by step and checks each layer under the microscope during the procedure. This can help save more healthy tissue and may lower the chance of the disease returning, especially in delicate areas such as the vulva, scrotum, penis, or around the anus.
Radiation uses targeted high-energy beams to treat the affected area without an operation. It may be used when surgery is not a good fit, after surgery in selected cases, or when extramammary Paget disease has come back in the same area.
Some non-drug options are delivered by specialists, including laser treatment or photodynamic therapy, which uses a light-activated treatment on the skin. These approaches may help in selected superficial cases, but they are not the best choice for everyone and usually need close follow-up.
Your genes may have an impact on how drugs work for you
For most people living with extramammary Paget disease, there is not yet a routine genetic test that clearly predicts how well the usual treatments will work or which side effects someone will have. In day-to-day care, treatment choices are usually based more on where the disease is, how deep it goes, and whether it has spread, rather than on inherited gene differences. For advanced cases, doctors may sometimes test the cancer itself for changes that could open the door to certain targeted medicines, but this is not part of standard treatment for everyone.
Pharmacological treatments
Medicines for Extramammary Paget disease are usually considered when surgery is not a good fit, when the disease comes back, or when it has spread. The most commonly used drug treatments include skin-applied creams such as imiquimod and, less often, 5-fluorouracil, as well as anticancer drugs given by vein for advanced disease. Not everyone responds to the same medication in the same way. In some cases, testing the tumor for markers such as HER2 can help guide treatment choices.
Imiquimod is a skin treatment that helps the immune system attack abnormal cells in the affected area. It may be used for Extramammary Paget disease limited to the skin, especially if surgery would be difficult or after a recurrence.
5-fluorouracil, often shortened to 5-FU, is another cream that can be used on the skin to target diseased cells. It is used less often than imiquimod for Extramammary Paget disease because irritation can be strong and results may be less consistent.
Docetaxel and paclitaxel are chemotherapy drugs often used when Extramammary Paget disease has spread beyond the skin. For many, this can mean treatment every few weeks to slow growth, ease symptoms, and help control advanced disease.
Cisplatin or carboplatin may be combined with other chemotherapy drugs for more extensive disease. These combinations are part of treatment options for Extramammary Paget disease that has spread, although side effects and overall health need careful review.
Genetic influences
For many living with extramammary Paget disease, one of the biggest questions is why it developed in the first place. It’s natural to ask whether family history plays a role. In most cases, extramammary Paget disease does not seem to be a clearly inherited condition; the gene changes linked to it are usually acquired in the affected skin cells during life rather than passed down from a parent. When doctors talk about the genetic causes of extramammary Paget disease, they often mean changes inside the tumor itself, including changes in genes that control cell growth such as HER2 and PIK3CA. These findings can matter because they may help guide treatment in some people, but they do not usually mean relatives are at high risk. If extramammary Paget disease occurs alongside a strong family history of cancer or several related cancers in one family, doctors may sometimes consider a broader inherited cancer assessment.
Is Extramammary paget disease genetic?
Genetics are not a major driver in most cases of Extramammary Paget disease. Most people with Extramammary Paget disease do not inherit it. Genetic changes can be found in tumor cells, but these are usually acquired during life rather than passed down in families.
Having a genetic risk is not necessarily a diagnosis
Changes in genes are a usual part of human biology and are common throughout the general population. Most of these changes do not directly affect health and simply reflect normal human diversity. For many genes, having a change connected to a condition suggests a possible link rather than a certain diagnosis, especially when several genes and environmental factors are involved. Still, in some cases, one well-understood change in a particular gene is enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
For many living with extramammary Paget disease, treatment often starts with local care such as surgery, creams, or radiation, but genetics can become more important if the disease comes back, spreads, or is hard to control. In these situations, doctors may test the tumor itself for DNA changes, because some of those changes can point to medicines that are more likely to help. Genetics is only one factor, but in advanced extramammary Paget disease, a tumor with extra HER2 activity may respond to HER2-targeted treatment, which is already used in some other cancers. Other gene changes may help doctors decide whether a targeted drug or an immunotherapy is worth considering, although this is not helpful for everyone and the evidence is still limited because extramammary Paget disease is rare. This also means that genetic testing for extramammary Paget disease treatment usually looks at changes in the cancer cells, not inherited changes you were born with. Even when testing finds a change, doctors still match that result with the size of the cancer, where it is located, your overall health, and how well earlier treatments worked.
Interactions with other conditions
Extramammary Paget disease can sometimes occur alongside other health problems, especially cancers in nearby organs such as the bladder, urethra, prostate, rectum, or cervix, depending on where the skin changes are. In some people, the rash-like area is a skin problem on its own, while in others it may be linked to a cancer underneath or close by, which is why doctors often look beyond the skin. Doctors call it a “comorbidity” when two conditions occur together. Day to day, this matters because symptoms of extramammary Paget disease can look a lot like eczema, fungal infection, or dermatitis at first, so early symptoms of extramammary Paget disease may be mistaken for a more common skin condition and treatment can be delayed. If someone also has another cancer or a long-standing inflammatory skin problem in the same area, sorting out what is causing itching, burning, or soreness can take careful testing. Because of these possible links, care for extramammary Paget disease often includes checking for related illnesses and coordinating treatment across dermatology, cancer, and sometimes urology or gynecology specialists.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Extramammary paget disease?
Because it often shows up as a long-lasting red, itchy, scaly, or sore patch in the genital or anal area, extramammary Paget disease is often mistaken for eczema or other skin irritation, yeast or fungal infections, psoriasis, or lichen sclerosus, which is another long-term skin condition that can affect these areas. In some people, it can also look like other early skin cancers. This is why doctors often need to take a small skin sample if the rash does not go away with usual treatment.
History
Extramammary Paget disease has been recognized for well over a century, usually as a slow-changing skin condition that appears in areas rich in sweat glands, such as the genital or anal region. For many living with it, the history matters because it helps explain why this disease was often mistaken for more common problems like eczema, a fungal rash, or simple skin irritation. Someone might have itching, burning, or a red scaly patch that keeps coming back, only to learn much later that it is something quite different.
First described in the medical literature as a condition similar to Paget disease of the nipple, extramammary Paget disease was identified in the late 1800s when doctors began noticing the same distinctive cell changes outside the breast. Early reports were based mainly on what could be seen on the skin and under the microscope, so diagnosis depended heavily on careful examination and biopsy. Because the rash-like appearance could look harmless at first, many cases were likely missed or labeled as other skin disorders.
As medical science evolved, doctors learned that extramammary Paget disease can behave in more than one way. In some people it stays limited to the top layer of the skin for a long time, while in others it may be linked to deeper disease or to cancers nearby or elsewhere in the body. That growing understanding changed how the condition was evaluated, leading to more careful skin sampling, closer follow-up, and broader testing when needed.
In recent decades, awareness has grown as pathology techniques improved and more cases were reported worldwide. This helped doctors better recognize the early symptoms of extramammary Paget disease, especially when a persistent rash does not improve with standard creams or comes back repeatedly in the same spot. Researchers later identified a genetic cause in some cases at the tumor level, but the main historical shift for patients has been practical: earlier biopsy, more accurate diagnosis, and treatment plans that better match how far the disease has spread.
Today, the history of extramammary Paget disease is still shaping care. What was once thought to be an unusual rash is now understood as a rare but important skin cancer that can require long-term monitoring. Knowing this background can make the long path to diagnosis feel a little more understandable, especially for people who spent months or years being treated for the wrong skin condition first.