Nodular lichen myxedematosus is a rare skin condition that usually affects adults and causes small, firm bumps or nodules in the skin. The early symptoms of Nodular lichen myxedematosus are often mild, and many people notice visible skin changes more than pain or itching. Nodular lichen myxedematosus is usually long lasting, but it is generally limited to the skin and is not usually life threatening. Not everyone will have the same experience. Treatment for Nodular lichen myxedematosus often focuses on managing bothersome spots and may include corticosteroid creams or injections, or sometimes removal of isolated nodules.
How many people live with Nodular lichen myxedematosus?
There are no reliable estimates of how many people live with nodular lichen myxedematosus worldwide or in the United States. This condition is extremely rare and has mostly been described in small case reports, so published medical sources do not provide a trusted global or U.S. count.
Overview
Nodular lichen myxedematosusSymptoms
Nodular lichen myxedematosus usually causes firm, waxy, skin-colored or pink bumps or nodules, often on the arms, legs, or trunk. These spots may be painless, though some people notice mild itching or tenderness.
Outlook and prognosis
For many living with nodular lichen myxedematosus, the outlook is generally good. The skin nodules often stay localized and do not affect internal organs. Some may find the bumps persist or slowly change over time, so follow-up can help track symptoms.
Causes and risk factors
The cause of nodular lichen myxedematosus is unclear. It may involve abnormal buildup of skin mucin and overactive connective tissue cells. Unlike some related disorders, nodular lichen myxedematosus is usually not tied to thyroid disease, and clear lifestyle or environmental risk factors are not known.
Genetic influences
Genetics do not appear to play a major role in nodular lichen myxedematosus. Most cases are not inherited, and no single gene change has been clearly linked to it.
Diagnosis
Nodular lichen myxedematosus is usually diagnosed from the skin's appearance and a skin biopsy. Blood tests may be done to rule out thyroid disease or a plasma cell disorder.
Treatment and drugs
Treatment for nodular lichen myxedematosus usually focuses on easing bothersome skin nodules and itching. Many living with nodular lichen myxedematosus may be offered strong steroid creams, steroid injections into thicker bumps, or careful monitoring when symptoms are mild.
Symptoms
People with nodular lichen myxedematosus usually notice small, firm skin bumps long before they feel any other problem. The early symptoms of nodular lichen myxedematosus are often a few slowly appearing raised spots, most often on the arms, legs, or trunk, and symptoms vary from person to person and can change over time. Unlike the more widespread related form, this type is usually limited to the skin and does not commonly cause whole-body symptoms.
The most noticeable symptom is one or more small, firm raised bumps on the skin. They are often flesh-colored, pink, or slightly waxy and can feel smoother or tighter than the skin around them.
These bumps most often show up on the arms, legs, or trunk, although other areas can be affected. Many people notice several spots in one area rather than a single isolated bump.
The spots usually appear gradually and tend to stay for a long time instead of fading within days or weeks. Because they change slowly, they may first seem like scars, bug bites, or another harmless skin change.
Many people with nodular lichen myxedematosus have little or no pain from the bumps. Some may notice mild itching, tenderness when pressed, or irritation from tight clothing or friction.
How people usually first notice Nodular lichen myxedematosus?
Many people first notice nodular lichen myxedematosus when a few small, firm, waxy-looking bumps or nodules appear on the skin and do not go away. These spots are often skin-colored to pink and may slowly increase in number over time, most often on the arms, legs, trunk, or hands, while the rest of the skin seems normal. For many living with this condition, the first warning sign is simply persistent new lumps on the skin rather than feeling sick, which is why it is often first recognized during a skin exam.
Types of Nodular lichen myxedematosus
Nodular lichen myxedematosus does not have widely accepted subtypes of its own. Instead, it is itself considered a rare localized form of lichen myxedematosus, and people living with nodular lichen myxedematosus may differ mainly in how many nodules they have, where they appear, and how noticeable they are in daily life. Symptoms don’t always look the same for everyone, but the main pattern is firm, raised skin nodules without the more widespread body involvement seen in systemic forms of the disease. In other words, when people ask about the types of nodular lichen myxedematosus, experts generally do not divide it into separate recognized types.
Can I slow down the onset of symptoms?
For nodular lichen myxedematosus, there is no good evidence that lifestyle changes or medicines can meaningfully delay when symptoms start. Because this is a rare skin condition and its cause is still not well understood, habits like diet, exercise, sleep, or taking supplements have not been shown to prevent it, and there are no established screening or preventive treatment guidelines. If new, firm skin bumps appear, seeing a skin doctor early can help with diagnosis and symptom relief, and while general healthy habits are still good for overall well-being, they may not change when this condition begins.
What genetics can tell you about symptoms
For people with nodular lichen myxedematosus, genetics does not currently tell us much about which symptoms will happen, how severe they will be, or when they will start. This condition is usually not thought to be inherited, and there are no well-established gene changes that doctors use to predict the number of skin bumps, how fast they appear, or whether symptoms stay limited to the skin. In most cases, symptoms are judged by the skin findings themselves and by checking for other health problems, rather than by genetic testing.
Causes and risk factors
The exact causes of nodular lichen myxedematosus are still unclear. It seems to happen when the skin stores too much mucin, a gel-like substance made by the body. Researchers are still learning how these pieces fit together. It is usually not inherited, and no specific gene has been shown to cause nodular lichen myxedematosus. Most cases are seen in adults, but clear environmental or lifestyle triggers such as diet, smoking, or sun exposure have not been proven.
What are the most common causes or risk factors?
For nodular lichen myxedematosus, the cause is usually unknown. There is no well-proven inherited genetic cause, and it is usually not linked to thyroid disease, so no clear lifestyle, family-history, or environmental risk factors have been confirmed. In other forms of this rare skin condition, doctors sometimes find immune system problems or an unusual protein in the blood, but those links are much less clear for the nodular type.
Environmental and biological risk factors
The exact risk factors for nodular lichen myxedematosus are not fully understood. Most reports suggest it appears more often in adults and may relate to changes in immune signaling in the skin. Doctors often group risks into internal (biological) and external (environmental). For this condition, the strongest clues so far are biological, while clear environmental triggers have not been proven.
Nodular lichen myxedematosus is reported mainly in adults rather than in children. This pattern suggests that age-related changes in skin and immune function may increase the chance of it developing.
Many experts think altered immune activity in the skin helps drive this condition. When immune signals are out of balance, they may push skin cells to make too much of the gel-like material that forms the nodules.
In nodular lichen myxedematosus, certain skin cells can become overactive and produce excess mucin and connective tissue material. This is a key biological factor behind how the nodules form, even when no outside trigger is found.
No specific environmental exposure has been clearly proven to cause nodular lichen myxedematosus. Variation in environment explains why risk doesn’t look the same for everyone, but current evidence points more strongly to body-based factors than to outside ones.
Genetic risk factors
For nodular lichen myxedematosus, the genetic picture is still unclear. No single inherited gene change has been proven to cause it, and most reported cases happen in people with no known family history. Risk is not destiny—it varies widely between individuals. Because this condition is so rare, research on the genetic causes of nodular lichen myxedematosus is limited.
No proven gene: No single gene variant has been confirmed as a cause of nodular lichen myxedematosus. For many living with this condition, genetic testing does not point to one clear inherited explanation.
Sporadic cases: Most reported cases appear sporadically, meaning they happen without a clear pattern of inheritance in a family. Based on what is known so far, a strong hereditary risk seems unlikely for most people.
Family history: A family history of nodular lichen myxedematosus is uncommon in published reports. If several relatives have similar skin nodules or unusual mucin buildup in the skin, doctors may look for another inherited condition that can mimic it.
Research limits: Nodular lichen myxedematosus is very rare, so studies have been too small to identify reliable genetic risk factors. At this time, there is no well-established genetic subtype or inherited pattern.
Lifestyle risk factors
Nodular lichen myxedematosus is a rare skin disorder, and there are no clearly proven lifestyle habits that are known to cause it. In practice, how lifestyle affects nodular lichen myxedematosus is mostly about symptom aggravation, skin irritation, and healing rather than disease onset. Because evidence is limited, the main focus is on reducing factors that can inflame the skin or make nodules more bothersome.
Repeated rubbing, scratching, shaving, or pressure on affected areas can make nodules more irritated and noticeable. Minimizing friction may reduce discomfort and help prevent secondary skin damage.
Smoking can worsen small-vessel blood flow and delay skin repair, which may make irritated lesions slower to settle. It may also increase background inflammation that can aggravate symptoms in some people.
Heavy alcohol use can promote dehydration and flushing, which may make the skin feel more reactive or itchy. It can also impair recovery if lesions become inflamed or broken from scratching.
Harsh soaps, fragranced products, over-exfoliation, and very hot showers can dry and irritate affected skin. Gentler cleansing and regular moisturizing may help reduce itch and surface inflammation around nodules.
Risk prevention
There is no proven way to fully prevent nodular lichen myxedematosus, because its exact cause is not well understood. For many living with nodular lichen myxedematosus, prevention is mainly about lowering the chance of skin irritation, spotting changes early, and checking for related health issues when needed. Prevention is about lowering risk, not eliminating it completely.
There is no established method to stop nodular lichen myxedematosus from starting. The most practical goal is to reduce triggers that may irritate the skin and to get new bumps assessed early.
Harsh soaps, strong scrubs, and frequent friction can aggravate sensitive skin. Using mild cleansers and bland moisturizers may help protect the skin barrier and reduce irritation around nodular lichen myxedematosus lesions.
Repeated rubbing, scratching, or pressure on the same areas can make skin problems harder to settle. If a spot catches on clothing or becomes itchy, protecting the area may help limit further irritation.
In some people, new or worsening skin eruptions deserve a review of medicines, supplements, and recent exposures. Talk to your doctor if nodular lichen myxedematosus appeared after a treatment change or alongside other new symptoms.
Can you prevent Nodular lichen myxedematosus?
No, there is no known way to prevent nodular lichen myxedematosus at this time, because the exact cause is still not clear. Healthy skin habits and regular medical care are good for overall health, but they have not been shown to stop this condition from developing. If new firm skin bumps appear, getting them checked early can help with diagnosis and care.
Transmission
Nodular lichen myxedematosus is not contagious, so it does not spread from one person to another through touch, kissing, sex, shared items, or the air. Many living with Nodular lichen myxedematosus have visible skin bumps that may worry others, but being around someone with this condition does not put you at risk.
When people ask how Nodular lichen myxedematosus is inherited, the key point is that it is not usually passed from parent to child. Most cases seem to happen sporadically, and doctors do not consider Nodular lichen myxedematosus an infectious disease.
When to test your genes
For nodular lichen myxedematosus, genetic testing is not part of routine diagnosis, early detection, or treatment planning. This condition is generally not known to be driven by inherited gene changes, so care is guided by your skin findings, symptoms, and tests that look for related medical problems rather than your genes.
Diagnosis
Nodular lichen myxedematosus is usually diagnosed when new, firm skin bumps lead someone to see a dermatologist, often because the spots are persistent or slowly increasing. The diagnosis of Nodular lichen myxedematosus is based mainly on how the skin looks and feels, then confirmed with a small skin sample. It’s natural to worry when symptoms don’t have a clear explanation. Because this condition is uncommon, doctors also check for other skin disorders and for the broader form of lichen myxedematosus that can affect more of the body.
A dermatologist looks closely at the size, number, and distribution of the nodules and checks whether the surrounding skin is thickened or inflamed. They also ask when the bumps started, whether they have changed, and if there is itching, tenderness, or tightening of the skin.
Doctors usually begin by asking about overall health, medicines, autoimmune disease, thyroid problems, and any past blood disorders. This helps show whether the skin findings are staying limited to the skin or could be part of a wider illness.
A small sample of one nodule is removed and examined under a microscope. The biopsy typically shows extra mucin, a gel-like substance in the skin, along with changes in connective tissue cells that support the diagnosis.
Blood and urine tests may help rule out common conditions and look for signs of an associated monoclonal protein, which is an abnormal antibody sometimes linked to related disorders. These tests can also check thyroid function and screen for inflammation or other causes of similar skin changes.
How is Nodular lichen myxedematosus diagnosed?
Doctors usually diagnose nodular lichen myxedematosus by examining the skin bumps, asking about when they began and whether you have any other symptoms, and confirming the diagnosis with a small skin sample checked under a microscope. Blood tests are often used to rule out other causes of similar skin changes, such as thyroid problems or signs that the condition is part of a more widespread illness. There is no standard genetic test used to diagnose this condition.
Stages of Nodular lichen myxedematosus
Nodular lichen myxedematosus does not have defined progression stages. This is because it is usually identified by the appearance of firm skin bumps rather than by a predictable pattern of step-by-step worsening over time. Doctors usually start with a conversation about when the bumps appeared, whether they are changing, and whether there are symptoms such as itching or tenderness; the early symptoms of nodular lichen myxedematosus are often simply new clusters of small nodules on the skin. Diagnosis is usually based on a skin exam and often a small skin sample, called a biopsy, to confirm the pattern under the microscope and to help rule out other skin conditions.
Outlook and prognosis
The outlook for nodular lichen myxedematosus is generally favorable, because it is usually a chronic but benign skin-limited condition without the systemic complications seen in scleromyxedema. Lesions may persist for years and can remain stable or slowly progress, but some patients experience partial improvement over time. Overall life expectancy is not thought to be reduced, and mortality directly related to nodular lichen myxedematosus has not been reported as a typical feature. Prognosis is best when evaluation confirms there is no associated monoclonal gammopathy, thyroid disease, or internal organ involvement. Even when the disease is not dangerous, cosmetic concerns, itching, or discomfort can affect quality of life and may justify ongoing dermatologic follow-up.
Long-term effects
Nodular lichen myxedematosus usually affects the skin over the long term rather than the internal organs. For many, this can mean bumps that stay for months or years, sometimes changing slowly in number or size rather than clearing quickly. Long-term effects vary widely, but this condition is generally considered a localized form with a more favorable outlook than widespread forms of lichen myxedematosus. The early symptoms of nodular lichen myxedematosus can give way to persistent skin nodules that may need monitoring over time.
The most common long-term effect is ongoing firm skin bumps that may remain stable or slowly enlarge over time. In many people, they last for years rather than going away on their own.
Some people with nodular lichen myxedematosus develop additional nodules over time, even if the first ones change very little. This can make the condition feel unpredictable, especially when new spots appear in previously unaffected skin.
Affected areas may continue to feel thick, raised, or uneven, which can be noticeable during daily activities like dressing or washing. Some may find the skin looks different even when it is not painful.
The nodules are often not severely symptomatic, but some people notice itching, mild soreness, or sensitivity with pressure and friction. These symptoms can come and go rather than stay constant.
How is it to live with Nodular lichen myxedematosus?
Living with nodular lichen myxedematosus often means dealing with firm, raised skin bumps that may be mostly a cosmetic concern but can also feel itchy, tender, or bothersome when they rub against clothing or draw unwanted attention. For many people, the hardest part is not danger to overall health but the uncertainty of a rare condition and the way visible skin changes can affect comfort, confidence, and social ease. Daily life is often shaped by watching for irritation, protecting the skin, and keeping dermatology follow-up appointments, while family and close friends may mainly notice the emotional impact rather than major physical limitations, since this localized form usually does not cause the widespread internal problems seen in some other skin disorders.
Treatment and drugs
Nodular lichen myxedematosus is usually treated based on how bothersome the skin lumps are, since many people have a limited form that stays in the skin and does not affect the rest of the body. Some may find that treatment starts with close follow-up, while thicker or itchy bumps may be treated with creams, steroid injections into the spots, or procedures that remove or flatten them, such as freezing or minor surgery. Treatment often looks different for each person, because the number of nodules, their size, and where they appear can all affect what is practical and helpful. If the disease is more widespread or keeps coming back, a skin specialist may consider stronger medicines that calm the immune system, but this is less common. If you are wondering about the best treatment for nodular lichen myxedematosus, a dermatologist can help weigh symptom relief, cosmetic concerns, and possible side effects before choosing a plan.
Can you cure Nodular lichen myxedematosus?
No, there is no known cure for nodular lichen myxedematosus at this time. Treatment can still help by easing symptoms and improving the look or feel of the skin, for example with medicated creams, shots into the bumps, or removing bothersome growths. Because this condition is rare and can vary from person to person, treatment is usually chosen based on what is bothering you most.
Non-drug treatment
Many living with nodular lichen myxedematosus are most bothered by firm skin bumps that catch on clothing, feel tender with pressure, or become a cosmetic concern. Because this condition is rare and often stays limited to the skin, non-drug care is usually tailored to symptoms, the size and location of the nodules, and how much they affect daily life. For many, treatment begins not at the pharmacy, but with skin protection, watchful follow-up, and, when needed, office-based procedures to remove or flatten bothersome spots.
If the nodules are small and not causing problems, regular skin checks with a dermatologist may be enough. This helps track any change in number, size, or irritation without rushing into treatment.
Gentle skin care can help reduce rubbing, soreness, and accidental injury to raised areas. Soft clothing, mild cleansers, and simple moisturizers may make nodules less likely to catch or become irritated.
Cool compresses and careful skin care may ease itching or tenderness when lesions are inflamed by friction. Keep track of how lifestyle changes affect your symptoms, especially if early symptoms of nodular lichen myxedematosus seem to flare after pressure or skin trauma.
Some non-drug options are delivered by specialists, including surgical removal of a bothersome nodule. This may be considered when a lesion is painful, repeatedly traumatized, or troubling because of its appearance.
Your genes may have an impact on how drugs work for you
For people living with nodular lichen myxedematosus, there is no well-established evidence that inherited gene differences are used in routine care to predict which medicines will work best or cause side effects. In day-to-day practice, treatment response tends to vary more because this condition is rare, can show up differently from one person to another, and may be affected by things like overall health, other medicines, and how active the skin problem is. This means care is usually based on close follow-up and adjusting treatment over time, rather than on genetic testing.
Pharmacological treatments
Treatment for nodular lichen myxedematosus is often individualized, because this rare skin condition does not have one standard, approved drug. When the nodules are not causing symptoms, some people may not need medicine at all, but bothersome itching, tenderness, or visible bumps may lead a dermatologist to try off-label treatments. Not everyone responds to the same medication in the same way. In practice, doctors usually start with medicines applied to or injected into the skin before considering pills.
Strong prescription steroid creams or ointments such as clobetasol may be used to calm inflammation and flatten some nodules. They are usually tried for limited areas and for a defined period, because long use can thin the skin.
Triamcinolone injected directly into a nodule may help shrink thicker or more stubborn bumps. This is often used when there are only a few lesions and the goal is to treat them more precisely.
Tacrolimus ointment, and sometimes pimecrolimus cream, may be considered when doctors want a nonsteroid option for sensitive skin areas or longer-term use. Evidence is limited, but some people with localized disease improve with these anti-inflammatory medicines.
Prednisone or similar steroid tablets are not first choice for small, localized nodules, but they may be used in selected cases when symptoms are more disruptive. Because side effects can build up over time, they are usually reserved for short-term use.
Genetic influences
Many living with nodular lichen myxedematosus wonder whether it is something they could pass on to their children. It’s natural to ask whether family history plays a role. Right now, doctors do not know of a single gene change that clearly causes nodular lichen myxedematosus, and most reported cases appear to happen sporadically rather than strongly running in families. That means genetics may play some part in how the skin and immune system respond, but any inherited influence seems uncertain and is not considered the main explanation in most people. If several relatives have similar skin bumps or thickened patches, a specialist may look more closely to confirm the diagnosis, since other skin conditions can sometimes look alike. For now, genetic testing is not a routine part of care for nodular lichen myxedematosus.
Is Nodular lichen myxedematosus genetic?
Genetics do not appear to play a major role in nodular lichen myxedematosus. Most cases are not inherited, and no single gene change has been clearly linked to it.
Having a genetic risk is not necessarily a diagnosis
Genetic variants are a normal feature of human biology and are widely seen in the general population. Most do not have a direct effect on health and simply make up part of natural human diversity. For many genes, having a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes and environmental factors play a role. In some situations, though, one well-characterized variant in a particular gene may be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
For many living with nodular lichen myxedematosus, the biggest question is whether there is a test that can show which treatment is most likely to help. At this point, genetics do not have a clear, routine role in choosing treatment for nodular lichen myxedematosus, and there is no established gene test that predicts which cream, injection, or other therapy will work best. Genes can influence how quickly you process some medicines, but for this rare skin condition, doctors usually base treatment decisions more on the number and location of the nodules, how bothersome they are, and how the skin responds over time. This means care is often individualized, and some may find that one approach helps a few isolated bumps while another is needed if the spots are more widespread or keep coming back. If genetic testing is discussed, it is usually for a broader reason, such as checking general medication safety or looking for another related condition, rather than because nodular lichen myxedematosus itself has a proven pharmacogenetic treatment plan.
Interactions with other conditions
Nodular lichen myxedematosus is usually a skin-limited condition, so most people do not develop the body-wide problems seen in some other mucin skin disorders. Even so, doctors often look for other illnesses that can cause similar bumps or thicker skin, such as thyroid disease, connective tissue diseases, or rare blood protein disorders, especially if the diagnosis is uncertain or the rash is changing. The presence of another illness does not always mean it is linked to nodular lichen myxedematosus, but checking for overlap can help avoid missing a different condition that needs treatment. For many living with nodular lichen myxedematosus, this means the main interaction with other diseases is less about the skin bumps affecting other organs and more about making sure the bumps are not a sign of something else. If you are reading about early symptoms of nodular lichen myxedematosus, it can help to know that new fatigue, weakness, swallowing trouble, or widespread skin hardening are not typical and should prompt a medical review. In most cases, once nodular lichen myxedematosus is confirmed, ongoing care focuses on the skin unless other symptoms suggest a separate health issue.
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 Nodular lichen myxedematosus?
Other skin problems that can look similar include granuloma annulare, dermatofibromas, rheumatoid nodules, and a thyroid-related skin condition that often affects the shins, because all of these can cause firm, flesh-colored bumps or thickened patches. Doctors also make sure it is not the more widespread form called scleromyxedema, since that can look similar on the skin but may be linked to problems elsewhere in the body.
History
People living with nodular lichen myxedematosus often notice firm bumps in the skin that can linger for years, so it is understandable to wonder when doctors first began to recognize this pattern. Rather than being identified all at once, nodular lichen myxedematosus emerged gradually from reports of people who had waxy, raised skin lesions without the broader body-wide problems seen in some related conditions.
As medical science evolved, doctors began separating these localized skin conditions from other disorders that can also cause thickened or swollen skin. Early descriptions were based only on what could be seen on the skin and under the microscope, so classification was not always consistent. Some people were grouped together even though their symptoms were not exactly the same, and names changed as specialists learned which forms stayed limited to certain areas and which forms were linked to more serious illness elsewhere in the body.
By the late 20th century, dermatologists had a clearer picture of nodular lichen myxedematosus as one of the localized forms of lichen myxedematosus. This helped explain why many living with nodular lichen myxedematosus have clusters of small nodules or papules on the limbs or trunk but do not develop the widespread skin tightening that defines other related disorders. In everyday life, that difference matters: someone may be dealing mainly with persistent cosmetic changes or mild discomfort rather than the broader health problems seen in systemic disease.
In recent decades, awareness has grown as pathologists and skin specialists refined the definitions further. Researchers also learned that these conditions involve extra mucin, a gel-like substance, building up in the skin, which helped make diagnosis more accurate. Not every early description was complete, yet together they built the foundation of today’s knowledge, including how doctors distinguish nodular lichen myxedematosus from similar-looking rashes, scars, or connective tissue diseases.
Today, the history of nodular lichen myxedematosus is still one of careful observation. The condition remains uncommon, and some older case reports would likely be classified differently now, but the overall trend has been toward clearer diagnosis and better recognition. Knowing this history can help make sense of why early symptoms of nodular lichen myxedematosus may once have been confusing, and why seeing a dermatologist familiar with rare skin conditions can be important.