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Living with PENS syndrome

A very rare skin condition with small rough spots present from birth, which can come with nervous system problems.

Understanding PENS syndrome

PENS syndrome is a very rare type of keratinocytic epidermal nevi, a skin condition that can come with birth differences and nervous system problems.

The skin spots are small, slightly scaly bumps with a rough, flat surface, in colors from white to brown. They may be visible at birth or soon after. About half of people have neurological symptoms, such as mild intellectual disability, seizures, or delayed development. Hearing loss, unusual facial features, and genital differences have been described in a few cases.

Signs & symptoms

GARD doesn't list specific symptoms, but the summary describes:

  • Small, rough, scaly skin bumps
  • Mild intellectual disability (about half of cases)
  • Seizures
  • Delayed development or clumsiness
  • Hearing loss (in a few cases)
  • Genital differences (in a few cases)

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 cancer specialists, genetic specialists and skin, hair, and nail specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
Cancer specialists (oncologists); 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 Nevus Outreach, Inc. and other patient organizations
  • 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
Should my child have a neurological exam if there are four or more skin spots?
Is a skin biopsy needed to confirm the diagnosis?
Should hearing be checked?

Quick facts

Symptoms usually startNewborn and as an Infant

GARD says the cause is not known. Several families have more than one affected member.

GeneticSkin

Also known as: papular epidermal nevi with skyline basal cell layers syndrome; pens (papular epidermal nevi with skyline basal cell layers) syndrome

Patient organizations

Source: NIH GARD · PENS syndromeGARD ID 13447 · 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 PENS syndrome.

Explore the PENS syndrome blog

Explore research for PENS syndrome

Explore actively recruiting PENS syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for PENS syndrome 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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