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Living with Prolidase deficiency

A rare genetic condition with a wide range of symptoms, including skin sores, infections, and an enlarged spleen.

Understanding Prolidase deficiency

Prolidase deficiency is an inherited disorder that causes a wide variety of symptoms and usually becomes noticeable in infancy.

People may have an enlarged spleen, sometimes with an enlarged liver. Diarrhea, vomiting, and dehydration can occur, along with skin or ear infections. Skin sores, especially on the hands, feet, lower legs, and face, can range from a mild rash to severe ulcers. Some people have delayed development or intellectual disability. Some people have no symptoms, and it is found by lab tests.

Signs & symptoms

Symptoms vary a lot from person to person. GARD lists these among the most common:

  • Skin sores or crusting rash
  • Enlarged spleen and sometimes liver
  • Frequent infections of the skin or ears
  • Widely spaced eyes and a flat nose bridge
  • Delayed development or intellectual disability
  • Hearing problems

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists, genetic specialists and skin, hair, and nail specialists.

  3. Consider genetic testing

    Changes in PEPD are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); Skin, hair, and nail specialists (dermatologists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Children's Skin Disease Foundation
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Would genetic testing for the PEPD gene help our family?
What can help skin sores heal?
Should other family members be tested?

Quick facts

Symptoms usually starta variety of ages
InheritanceAutosomal Recessive
GenesPEPD

This condition is caused by changes in the PEPD gene. A child inherits a changed copy of the gene from each parent (autosomal recessive).

GeneticNeurologicalSkinInherited Metabolic

Also known as: deficiency of imidodipeptidase; deficiency of prolidase; deficiency of proline dipeptidase; deficiency of xaa-pro dipeptidase; hyperimidodipeptiduria; hyperimidodipeptiduria due to proline dipeptidase deficiency

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Prolidase deficiencyGARD ID 7473 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Prolidase deficiency.

Explore the Prolidase deficiency blog

Explore research for Prolidase deficiency

Explore actively recruiting Prolidase deficiency studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Prolidase deficiency with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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