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Living with Diffuse nonepidermolytic palmoplantar keratoderma

A skin condition causing thick, yellowish skin on the palms and soles that starts in early childhood.

Understanding Diffuse nonepidermolytic palmoplantar keratoderma

Diffuse nonepidermolytic palmoplantar keratoderma, also called KRT1-related Unna-Thost keratoderma, mostly affects the skin of the palms and soles.

It usually begins in early childhood with red palms and soles. The skin gradually thickens and looks yellowish and waxy. Increased sweating is common, along with a tendency toward fungal and bacterial foot infections. It usually does not spread beyond the hands and feet but can affect knuckle pads and nails.

Signs & symptoms

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

  • Thick skin on palms and soles
  • Redness of the skin
  • Dry skin
  • Fungal nail infection
  • Increased sweating
  • Foot infections

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 genetic specialists and skin, hair, and nail specialists.

  3. Consider genetic testing

    Changes in KRT1 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    Foundation for Ichthyosis and Related Skin Types may keep lists of experts for this condition.

Care & treatment

Care team
Genetic specialists (geneticists); Skin, hair, and nail specialists (dermatologists)
Expert care
Expert lists: Foundation for Ichthyosis and Related Skin Types
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 Foundation for Ichthyosis and Related Skin Types 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
Can genetic testing of the KRT1 gene confirm the diagnosis?
Which skin treatments can help thickened skin?
How can we prevent foot infections?

Quick facts

Symptoms usually startInfant and as a Child
InheritanceAutosomal Dominant
GenesKRT1

Changes in the KRT1 gene cause this condition. It is autosomal dominant, so a changed copy of the gene from one parent can be enough.

GeneticSkin

Also known as: diffuse palmoplantar keratoderma, bothnian type; krt1-related diffuse nonepidermolytic keratoderma; neppk; non-epidermolytic palmoplantar keratoderma; nonepidermolytic palmoplantar hyperkeratosis; nonepidermolytic palmoplantar keratoderma

Patient organizations

Source: NIH GARD · Diffuse nonepidermolytic palmoplantar keratodermaGARD ID 5186 · 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 Diffuse nonepidermolytic palmoplantar keratoderma.

Explore the Diffuse nonepidermolytic palmoplantar keratoderma blog

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