Prolidase deficiency is a rare inherited condition that usually begins in childhood, although some people are recognized later. Early signs of Prolidase deficiency can include frequent skin sores, repeated infections, slow wound healing, and developmental or learning problems. Not everyone will have the same experience. Prolidase deficiency is lifelong, and severity varies, but serious complications can sometimes become life threatening without careful care. Treatment for Prolidase deficiency focuses on managing skin wounds and infections, supporting nutrition, and treating related problems with a specialist team.
How many people live with Prolidase deficiency?
There is no reliable current estimate of how many people are living with prolidase deficiency worldwide or in the United States. Major rare-disease references describe it as ultra-rare, with only about 70 reported people worldwide (MedlinePlus Genetics, 2024) to fewer than 100 reported cases worldwide (NIH Genetic and Rare Diseases Information Center, 2025), and they do not publish a separate U.S. count.
Overview
Prolidase deficiencySymptoms
Prolidase deficiency often causes frequent skin sores, repeated infections, and delayed wound healing. Many living with prolidase deficiency also have developmental delay, enlarged spleen, and distinctive facial features, though signs can vary and may start in early childhood.
Outlook and prognosis
Prolidase deficiency is lifelong, but outlook varies widely. Some people have ongoing skin sores, infections, or lung problems, while others have milder symptoms; regular follow-up and early treatment of complications can improve daily life and long-term health.
Causes and risk factors
Prolidase deficiency is caused by changes in both copies of the PEPD gene, usually inherited from carrier parents. Risk is higher when both parents carry the variant. Related parents can raise the chance of inheriting it.
Genetic influences
Genetics are central to prolidase deficiency. It is caused by harmful changes in both copies of the PEPD gene, and different genetic variations can affect how severe prolidase deficiency is and when problems begin.
Diagnosis
Prolidase deficiency is usually suspected from clinical features and lab findings. The diagnosis of prolidase deficiency is confirmed with genetic tests, and sometimes enzyme testing. Doctors may also use imaging or other tests to check related health problems.
Treatment and drugs
Treatment for prolidase deficiency focuses on day-to-day problems. Skin wounds may need careful wound care, antibiotics for infections, and pain relief; some people also need treatment for lung or immune problems. Regular follow-up helps adjust support as symptoms change.
Symptoms
Living with Prolidase deficiency can mean slow-healing skin problems, repeated infections, and delays in growth or learning. The early features of Prolidase deficiency may show up in infancy or childhood, but some people have milder signs. Skin changes are often what affect day-to-day life the most, especially when walking or being active hurts. Features vary from person to person and can change over time.
Painful skin sores, often on the lower legs or feet, are one of the most common signs. Even minor scrapes can heal slowly or reopen, which can make walking, sports, or wearing certain shoes hard.
Many people with Prolidase deficiency have repeated infections, especially in the skin, ears, sinuses, or lungs. Some seem to get sick more often than expected or take longer to recover.
Sitting, walking, talking, or other milestones may happen later than usual. Some children also have learning or thinking difficulties, while others are only mildly affected.
Some children grow more slowly than expected or have trouble gaining weight. Frequent illness or feeding difficulties can make growth harder to keep on track.
How people usually first notice Prolidase deficiency?
Prolidase deficiency is usually first noticed in infancy or early childhood, often when a baby or young child has skin that heals poorly, repeated leg or foot ulcers, frequent infections, or delays in growth and development. Some children also have a distinctive facial appearance, chronic lung or ear problems, an enlarged spleen, or developmental differences, and doctors may become concerned when several of these problems appear together rather than from one sign alone. Because the first signs of Prolidase deficiency can vary widely, some families first hear about it after blood or urine testing is done to explain slow healing, repeated infections, or other unexplained symptoms.
Types of Prolidase deficiency
No distinct types of Prolidase deficiency are widely recognized.
Can I slow down the onset of symptoms?
No, there is no good evidence that lifestyle changes or routine medical treatment can meaningfully delay the start of symptoms in prolidase deficiency, because it is a rare inherited condition caused by a change that is present from birth. Healthy habits still matter for overall well-being, and early care can help manage problems like slow wound healing, skin sores, infections, or low blood counts sooner, but that is different from preventing the condition or stopping it from appearing. Research on better treatments is ongoing, so staying in touch with a genetics or metabolic care team may help people living with prolidase deficiency get the best support as new options develop.
What genetics can tell you about symptoms
Genetics can tell you some things about symptoms in prolidase deficiency, but not everything. Changes in the PEPD gene are the cause of this condition, and different variants can affect how much the body’s prolidase enzyme still works, which may influence when symptoms begin and how severe problems such as slow-healing skin sores, frequent infections, developmental delay, or enlarged spleen can be. Even so, people with the same genetic change can have very different symptoms, so genetic results help explain risk and diagnosis but cannot predict the exact day-to-day course for one person.
Causes and risk factors
If a child has slow-healing skin sores or repeated infections, the cause in prolidase deficiency is genetic and not something a parent did. The main genetic cause of prolidase deficiency is changes in the PEPD gene, which means the body makes too little of a helpful enzyme. It is usually inherited when both parents carry one changed copy, so family history and parents from the same extended family can raise the risk. Having a gene change doesn’t mean you’ll definitely develop the condition. Lifestyle and environment do not cause prolidase deficiency, but infections, skin injury, and delayed care can affect how strongly symptoms show up.
What are the most common causes or risk factors?
Prolidase deficiency is almost always caused by inherited changes in a gene called PEPD, so the body cannot properly make the prolidase protein it needs to break down and reuse parts of collagen, an important protein in skin and other tissues. The main risk factor is being born to two parents who both carry the changed gene, even if the parents are healthy themselves; a family history of the condition also raises the chance. It is not usually caused by anything during pregnancy, diet, or lifestyle, but the risk can be higher when the parents are blood relatives, such as cousins.
Environmental and biological risk factors
When people look up risk factors for prolidase deficiency, it helps to know that this rare condition does not follow the usual pattern seen with many other disorders. Doctors often group risks into internal (biological) and external (environmental). For prolidase deficiency, researchers have not identified strong environmental or pregnancy-related biological factors that reliably increase the chance of the condition occurring. In practice, the early symptoms of prolidase deficiency are often more informative than exposure history.
No common environmental exposure has been clearly shown to cause prolidase deficiency. Air pollution, radiation, medications, or household chemicals have not been established as reliable risk factors.
A mother's age and most common health conditions have not been linked in a consistent way to prolidase deficiency. Unlike some congenital conditions, there is no well-established pattern pointing to usual pregnancy-related biological risks.
Prematurity, labor complications, and newborn illness are not known to create prolidase deficiency. These events can affect when a baby is evaluated, but they are not accepted causes of the condition.
Genetic risk factors
Prolidase deficiency happens when a child is born with changes in both copies of the PEPD gene, which the body uses to make the prolidase enzyme. These inherited changes reduce or remove enzyme activity, so the body has trouble breaking down certain protein building blocks. Carrying a genetic change doesn’t guarantee the condition will appear, because most carriers have only one changed copy and do not develop prolidase deficiency. When people ask about the genetic causes of prolidase deficiency, the main issues are the PEPD gene, family inheritance, and whether both parents carry a changed copy.
PEPD gene changes: Prolidase deficiency is caused by disease-causing changes in the PEPD gene. This gene helps the body make prolidase, an enzyme needed to recycle parts of collagen and some other proteins.
Carrier parents: Most children with prolidase deficiency inherit one changed PEPD copy from each parent. Parents who carry one changed copy are usually healthy carriers, but they can still pass the variant on.
Recessive inheritance: Prolidase deficiency is inherited in an autosomal recessive pattern, which means both gene copies must be changed for the condition to develop. If both parents are carriers, each pregnancy has a 25% chance of prolidase deficiency, a 50% chance of carrier status, and a 25% chance of inheriting two working copies.
Family history: A known case of prolidase deficiency in the family raises the chance that close relatives may also be carriers or affected. This is one of the clearest inherited risk factors for the condition.
Related parents: When parents are biologically related, such as cousins, they are more likely to carry the same rare PEPD variant. That makes it more likely that a child could inherit two changed copies.
Lifestyle risk factors
Prolidase deficiency is inherited, so lifestyle habits do not cause it, but daily choices can influence symptoms, wound healing, infections, and overall resilience. Because the condition often affects skin, growth, and the immune system, how lifestyle affects Prolidase deficiency is mostly about reducing stress on the body and supporting recovery. The most helpful habits are those that protect skin, maintain nutrition, lower infection risk, and match activity to energy and joint symptoms.
Poor calorie and protein intake can make it harder for the body to repair tissue and may worsen delayed wound healing in Prolidase deficiency. Regular, balanced meals with enough protein, iron, zinc, and vitamins can better support growth, skin repair, and recovery during illness.
Inadequate fluid intake can dry the skin and may slow wound healing, especially if ulcers or inflamed skin are present. Staying well hydrated helps support skin integrity and overall recovery.
Repeated friction, scratching, or neglect of daily skin care can aggravate ulcers and increase the chance of secondary infection. Gentle cleansing, moisturizing, pressure relief, and prompt care of small skin injuries can reduce complications.
Missed hand hygiene, poor dental care, and delayed attention to fevers or wounds can increase infection risk in a condition that may already involve immune problems. Consistent hygiene and early medical review of possible infections can help limit more serious setbacks.
Risk prevention
Because prolidase deficiency is an inherited condition, there is no known way to prevent the disorder itself from being passed on once a pregnancy has begun. For many living with prolidase deficiency, prevention is mostly about lowering the chance of complications such as skin ulcers, infections, breathing problems, and poor healing. Prevention is flexible—it adapts to your life and health background.
If prolidase deficiency runs in your family, genetic counseling can help you understand the chance of having an affected child. Carrier testing and reproductive planning may be options for some families before pregnancy.
Gentle daily skin care, moisturizing, and avoiding repeated friction or minor injuries can help lower the risk of painful wounds and ulcers. This is a key part of preventing skin ulcers in prolidase deficiency, especially for people who have already had slow-healing sores.
Even small cuts or scrapes should be cleaned and watched closely because healing can be slower in prolidase deficiency. Early treatment may reduce the chance of infection and deeper skin breakdown.
Keeping up with routine vaccines, hand hygiene, and early medical care for fevers or skin redness can help prevent infections from becoming more serious. Prevention works best when combined with regular check-ups.
Can you prevent Prolidase deficiency?
Prolidase deficiency cannot usually be prevented, because it is a rare inherited condition that a child is born with and it is not caused by diet, exercise, or other daily habits. If it runs in your family, genetic counseling and carrier testing before or during pregnancy may help you understand the chance of having an affected child, but they cannot change that risk on their own.
Transmission
Prolidase deficiency is a genetic condition, so it is not contagious and cannot spread through touching, kissing, coughing, sex, or sharing food. Instead, how Prolidase deficiency is inherited comes down to a child receiving two nonworking copies of the related gene, usually one from each parent.
Most parents of a child with Prolidase deficiency are healthy carriers, which means they have one working copy and one nonworking copy of the gene and usually do not have the condition themselves. When both parents are carriers, each pregnancy has a 25% chance of Prolidase deficiency, a 50% chance the child will be an unaffected carrier, and a 25% chance the child will inherit two working copies.
When to test your genes
Because prolidase deficiency is a rare inherited condition, genetic testing is most useful when someone has suggestive features, a sibling with the condition, or a known family variant. It can confirm the diagnosis, guide family planning, and help relatives understand their own risk.
Diagnosis
Prolidase deficiency is usually suspected when a child or adult has a pattern of problems that seem to connect, such as slow-healing skin sores, repeated infections, enlarged spleen, or developmental differences. Doctors often piece the diagnosis together from the medical history, the exam, and a few targeted lab tests, then confirm it with specific testing. Getting a diagnosis is often a turning point toward answers and support. Because this condition is rare, the diagnosis of prolidase deficiency may take time and sometimes involves a genetics specialist.
Doctors look for a combination of signs that fit prolidase deficiency, especially long-lasting leg ulcers, frequent infections, facial differences, and delayed development. No single symptom proves the condition, but the overall pattern can raise strong suspicion.
A key clue is finding unusually high levels of certain protein building blocks in the urine, especially imidodipeptides. This test can point doctors toward the genetic diagnosis of prolidase deficiency and help separate it from more common causes of skin wounds or developmental concerns.
Doctors may measure prolidase enzyme activity in blood cells or skin cells to see whether the enzyme is working properly. Very low or absent activity strongly supports the diagnosis.
Genetic tests can confirm changes in the PEPD gene, which causes prolidase deficiency. This helps make the diagnosis more certain and may also clarify whether other family members could be affected or carry the condition.
How is Prolidase deficiency diagnosed?
Doctors usually suspect prolidase deficiency based on a person’s symptoms and medical history, especially ongoing skin sores, repeated infections, or developmental delays. The diagnosis is usually checked with lab tests that show very low or missing prolidase, a body protein needed to break down certain proteins, and that find unusual protein pieces in the urine. A genetic test can then look for changes in the gene linked to the condition to help confirm the diagnosis.
Stages of Prolidase deficiency
Prolidase deficiency does not have defined progression stages. This is because it does not usually follow a steady step-by-step pattern over time; instead, signs can vary widely from one person to another and may be present from childhood without moving through set phases. Doctors usually start with a conversation about symptoms such as slow-healing skin sores, frequent infections, or developmental concerns, along with an exam and blood or urine tests. Genetic testing and enzyme testing are often used to confirm the diagnosis, and follow-up focuses on tracking day-to-day problems and early symptoms of prolidase deficiency rather than assigning a stage.
Outlook and prognosis
The outlook for people with prolidase deficiency is highly variable, ranging from relatively mild disease to severe, lifelong multisystem complications. Many affected individuals experience chronic skin ulcers, recurrent infections, lung disease, developmental challenges, or autoimmune features that can significantly reduce quality of life and require ongoing multidisciplinary care. Prognosis tends to be worse in those with early-onset, severe infections or progressive organ involvement, while some people remain comparatively stable for years with supportive treatment. There is no curative therapy at present, so management focuses on wound care, infection prevention, and treatment of specific complications, which can improve day-to-day functioning but may not stop disease progression. Mortality is increased in severe cases, particularly from overwhelming infection or serious systemic complications, although exact life expectancy is not well defined because the disorder is very rare and outcomes differ widely between individuals.
Long-term effects
For many living with prolidase deficiency, the long-term picture can range from relatively mild skin and joint problems to more widespread effects on growth, infections, and development. Long-term effects vary widely, even among people in the same family. In childhood, problems often show up through slow wound healing, repeated infections, or developmental delay, while some effects may continue or become more noticeable in adult life.
Slow-healing sores, especially on the legs and feet, can become a long-term problem in prolidase deficiency. These wounds may come and go over years and can leave scars or areas of damaged skin.
Many people with prolidase deficiency have repeated skin, ear, or lung infections over time. In some, infections are mild but recurrent, while in others they can be more serious and add to poor wound healing.
Joint pain, stiffness, or swelling can become a lasting issue, sometimes making walking or daily movement harder. Some people also develop changes that resemble long-term inflammation in the joints.
Children with prolidase deficiency may have delayed growth, delayed milestones, or learning difficulties that continue into later childhood or adult life. Early symptoms of prolidase deficiency can include developmental delay, but the degree of impact varies a lot from one person to another.
How is it to live with Prolidase deficiency?
Living with prolidase deficiency can look very different from one person to another, but for many it means managing chronic skin wounds, repeated infections, fatigue, and sometimes developmental or learning challenges that shape school, work, and daily routines. Some people need frequent wound care, careful skin protection, and regular follow-up with multiple specialists, so everyday life can require more planning than usual. For families and other close supports, this often means helping with dressings, appointments, and watching for signs of infection, while also adapting to the emotional strain of living with a rare condition whose symptoms can flare and ease over time.
Treatment and drugs
Treatment for prolidase deficiency focuses on managing symptoms and preventing complications, because there is no single cure that fixes the underlying genetic change. Care often includes regular wound care for slow-healing skin sores, prompt treatment of infections, and close follow-up for problems affecting the skin, lungs, immune system, or development, depending on how the condition shows up in each person. Doctors may also treat related issues such as pain, anemia, or breathing problems, and some people benefit from nutrition support and physical or developmental therapies. Not every treatment works the same way for every person, and treatment often looks different for each person as needs can change over time. Because prolidase deficiency is rare, care is often guided by specialists who tailor treatment to the early symptoms of prolidase deficiency and any later complications.
Can you cure Prolidase deficiency?
No, there is no cure for prolidase deficiency right now. Treatment focuses on managing the problems it can cause, such as skin sores, infections, pain, and other symptoms, and on supporting growth and development. Regular care from a medical team can help prevent complications and improve day-to-day quality of life.
Non-drug treatment
Daily care for prolidase deficiency often centers on protecting the skin, supporting growth and development, and helping with day-to-day function. Many living with prolidase deficiency need a mix of home routines and specialist therapies, especially when leg sores, delayed milestones, or feeding problems affect everyday life. Beyond prescriptions, supportive therapies can ease symptoms, lower the risk of complications, and improve comfort. Not every approach works the same way, so care is usually tailored to the problems each person has.
Careful cleaning, dressings, and regular skin checks are a main part of treatment when prolidase deficiency causes chronic leg sores or slow-healing wounds. Protecting pressure points, avoiding friction, and keeping the skin moisturized can help limit breakdown and pain.
Gentle bathing, moisturizing, and prompt care for small cuts may help prevent bigger skin problems. Some may find that soft clothing, supportive footwear, and avoiding bumps to the lower legs make daily life more manageable.
Physical therapy can help maintain strength, joint movement, balance, and endurance if pain, weakness, or limited mobility make walking and play harder. For many, treatment begins not at the pharmacy, but with guided exercises and practical ways to move more safely.
Occupational therapy focuses on everyday tasks such as dressing, bathing, handwriting, and using the hands comfortably. It can also suggest adaptive tools or home changes that support independence at school, work, or home.
Your genes may have an impact on how drugs work for you
For people living with prolidase deficiency, there are no widely accepted, condition-specific genetic rules that clearly predict how most common medicines will work or what dose is best. Even though this condition is caused by a change in a gene, treatment usually depends more on the problems a person is having, such as skin sores, infections, pain, or immune-related symptoms, and on how well their liver, kidneys, and overall health are doing. In everyday care, this means doctors usually watch closely for benefit and side effects and adjust treatment based on the person’s response, rather than using special gene-based drug testing for this condition.
Pharmacological treatments
Treatment for prolidase deficiency is mostly aimed at easing symptoms and preventing complications, because there is no proven medicine that corrects the underlying enzyme problem. Many living with prolidase deficiency need drugs mainly for skin wounds, infections, pain, or inflammation, and the plan can change over time depending on which problems are most active. Not everyone responds to the same medication in the same way.
There is currently no established medicine that reliably treats the root cause of prolidase deficiency. Care usually focuses on symptom control and careful follow-up rather than one standard disease-targeting drug.
Antibiotics such as cephalexin, amoxicillin-clavulanate, clindamycin, or trimethoprim-sulfamethoxazole may be used when skin ulcers become infected or when people with prolidase deficiency get repeated bacterial infections. The exact choice depends on the likely germ, allergy history, and how severe the infection is.
Medicated creams or ointments such as mupirocin or silver sulfadiazine may be used on some skin wounds to help control local infection and support healing. These drugs are usually part of a broader wound-care plan, which is often central when managing early symptoms of prolidase deficiency related to chronic leg ulcers.
Acetaminophen or nonsteroidal anti-inflammatory drugs such as ibuprofen may help with pain from ulcers, joint aches, or inflammation. These medicines can be useful day to day, but they do not treat the enzyme deficiency itself.
Genetic influences
For families dealing with slow-healing wounds, repeated infections, or developmental differences, it can help to know that prolidase deficiency is a clearly inherited condition. It is caused by changes in a gene called PEPD, which normally helps the body recycle certain building blocks from collagen, an important protein in skin and other tissues. Prolidase deficiency follows an autosomal recessive inheritance pattern, meaning a child is affected only if they inherit one changed copy of PEPD from each parent. A “carrier” means you hold the gene change but may not show symptoms. Even within the same family, people with prolidase deficiency can be affected very differently, from milder skin problems to more complex medical issues. When early symptoms of prolidase deficiency raise questions, genetic testing and counseling can help clarify the diagnosis, the chance of it happening again in a future pregnancy, and whether other relatives may also be carriers.
Is Prolidase deficiency genetic?
Genetics are central to prolidase deficiency. It is caused by harmful changes in both copies of the PEPD gene, and different genetic variations can affect how severe prolidase deficiency is and when problems begin.
Having a genetic risk is not necessarily a diagnosis
Gene variants are a normal part of being human and are common in the general population. Most do not directly affect health and simply reflect natural human diversity. For many genes, having a variant linked to a condition suggests a possible association rather than a definite diagnosis, especially when several genes and environmental factors are involved. In some cases, though, one well-understood variant in a particular gene can be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
For many living with prolidase deficiency, treatment is less about one fixed medicine and more about managing the problems that show up day to day, such as slow-healing skin wounds, infections, or lung and immune problems. Different changes in the PEPD gene can leave some people with a little more enzyme activity than others, which may affect how severe the condition is and how much treatment or monitoring is needed. Most drugs used to treat prolidase deficiency are aimed at complications rather than the root cause, so care often includes wound care, antibiotics when infections happen, pain relief, and treatment for related immune or breathing issues. Genetics is only one factor, so doctors also look at age, overall health, and which symptoms are most active when choosing medicines. At this time, pharmacogenetic testing to predict the best drug choice is not a routine part of prolidase deficiency care. Still, the genetic diagnosis matters because it confirms the condition, helps guide follow-up, and can help families talk with specialists about current and future treatment options for prolidase deficiency.
Interactions with other conditions
People living with prolidase deficiency may have health problems that affect more than one body system at the same time, so symptoms do not always come from the condition alone. Certain diseases may overlap, meaning some people with prolidase deficiency also develop immune system problems, including lupus-like illness, frequent infections, or ongoing inflammation that can make skin wounds and ulcers harder to heal. In day-to-day life, this can mean a sore on the leg lingers for weeks, or fevers and chest infections seem to keep coming back. Liver or spleen enlargement and anemia can also add to fatigue and poor overall health, especially when infections or inflammation are active. Because prolidase deficiency is rare and varies a lot from person to person, doctors often look at the full picture rather than assuming every symptom has one single cause.
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 Prolidase deficiency?
Other conditions that can look similar include Ehlers-Danlos syndrome and related conditions that affect the body’s support tissues, because they can also cause fragile skin, slow wound healing, and easy bruising. Doctors may also think about lupus and other immune system problems, especially when someone has long-lasting skin sores, repeated infections, or an enlarged spleen. In children, some other rare inherited conditions that affect how the body handles proteins can also cause delayed growth, developmental delays, and skin problems that may be mistaken for prolidase deficiency.
History
For many living with prolidase deficiency, the story often begins long before a diagnosis, with years of hard-to-explain skin sores, frequent infections, or delays in growth and development. Earlier generations of families and doctors saw these patterns but did not always realize they belonged to the same condition. In the 1960s, researchers began describing prolidase deficiency in the medical literature after finding people with a very unusual buildup and loss of certain protein building blocks in the body.
At first, doctors understood the condition mainly through what they could see: painful leg ulcers, repeated infections, enlarged spleen, and developmental concerns in some children. Because the symptoms can vary so much from one person to another, early reports were limited, and some people were likely missed or given other diagnoses instead. Over time, the way the condition has been understood has changed, and prolidase deficiency came to be recognized as a rare inherited metabolic disorder rather than a collection of unrelated problems.
As laboratory testing improved, researchers learned that the body was not breaking down some small protein fragments properly. This helped explain why connective tissues such as skin may be affected and why healing can be slow. Later, genetic research confirmed an underlying genetic cause, which made diagnosis more accurate and allowed families to get clearer answers.
The history of prolidase deficiency is also a reminder of how much rare conditions can hide in plain sight. A child with stubborn skin wounds or repeated infections might once have been treated only symptom by symptom, without anyone connecting the full picture. Today, even though prolidase deficiency is still uncommon, awareness is better than it used to be, and that history has helped doctors recognize the condition earlier and support people more effectively.