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Epidermolysis bullosa simplex
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Epidermolysis bullosa simplex

Epidermolysis bullosa simplex is a genetic skin disorder characterized by extreme fragility of the skin, leading to easy blistering and erosions from minor friction or trauma. The condition ranges from mild localized blistering to severe, widespread, and potentially life-threatening forms.

Overview and Major Types

Epidermolysis bullosa simplex (EBS) is one of the major forms of epidermolysis bullosa, a group of genetic conditions that cause the skin to be highly fragile. Blisters and areas of skin loss (erosions) occur in response to minor injury or friction, such as rubbing or scratching. While mild cases primarily affect the hands and feet and heal without scarring, severe cases involve widespread blistering that can lead to infections, dehydration, and other life-threatening medical problems in infancy.

Researchers have identified four major types of epidermolysis bullosa simplex, which are considered part of a single disorder with overlapping features:

  • Localized type (formerly called the Weber-Cockayne type): The mildest form, characterized by skin blistering that begins between childhood and adulthood and is usually limited to the hands and feet. Later in life, skin on the palms and soles may thicken and harden (hyperkeratosis).
  • Dowling-Meara type: The most severe form of EBS. Extensive, severe blistering can occur anywhere on the body, including the inside of the mouth, often appearing in clusters. Blistering is present from birth and tends to improve with age. Affected individuals also experience abnormal nail growth and hyperkeratosis of the palms and soles.
  • Other generalized type (formerly called the Koebner type): Associated with widespread blisters that appear at birth or in early infancy. The blistering tends to be less severe than in the Dowling-Meara type.
  • Mottled pigmentation type: Characterized by patches of darker skin on the trunk, arms, and legs that fade in adulthood. This form also involves skin blistering from early infancy, hyperkeratosis of the palms and soles, and abnormal nail growth.

Another related skin condition, known as the Ogna type, is caused by mutations in a different gene. It is unclear whether the Ogna type is a subtype of EBS or a separate form of epidermolysis bullosa.

Frequency

The exact prevalence of epidermolysis bullosa simplex is unknown, but the condition is estimated to affect 1 in 30,000 to 50,000 people. The localized type is the most common form.

Causes and Genetic Factors

The four major types of epidermolysis bullosa simplex typically result from mutations in either the KRT5 or KRT14 gene. These genes provide instructions for making proteins called keratin 5 and keratin 14, which work together to provide strength and resiliency to the outer layer of the skin (the epidermis).

Mutations in these genes prevent keratin proteins from assembling into strong networks, making cells in the epidermis fragile and easily damaged. Consequently, the skin blisters easily under minor friction or trauma. In rare cases, no KRT5 or KRT14 mutations are identified.

Associated Genes

  • KRT5: Encodes keratin 5, essential for epidermal structural integrity.
  • KRT14: Encodes keratin 14, which partners with keratin 5.
  • PLEC: Mutations in this gene, which provides instructions for the protein plectin (helping attach the epidermis to underlying skin layers), are associated with the rare Ogna type of EBS.

Inheritance Pattern

EBS is usually inherited in an autosomal dominant pattern, meaning one copy of the altered gene in each cell is sufficient to cause the disorder. Some affected individuals inherit the mutation from an affected parent, while other cases result from new mutations (de novo) in people with no family history of the disorder.

In rare cases, EBS is inherited in an autosomal recessive pattern, which requires two copies of the altered gene in each cell to cause the disorder. The parents of an individual with an autosomal recessive disorder typically each carry one copy of the altered gene but do not show signs and symptoms of the condition.

Other Names for This Condition

  • EBS

Frequently Asked Questions

Look for increasing redness, warmth, swelling, pus or foul odor around the blister, fever, or rapid spreading of skin breakdown. If any of these appear, contact a dermatologist or go to urgent care promptly.;How can I minimize friction‑induced blisters on my child’s hands and feet during everyday activities?::Dress the child in soft, breathable cotton socks and seamless gloves, use padded liners inside shoes, keep nails trimmed short, apply silicone or hydrocolloid dressings to high‑risk areas before activities, and avoid rough fabrics or tight bands that rub the skin.;What type of wound‑care products work best for the fragile skin of EBS?::Gentle, non‑adhesive dressings such as silicone‑gel sheets, non‑stick silicone pads, or low‑adherence hydrocolloid dressings are preferred. Clean the area with sterile saline, avoid antiseptic soaps that can irritate, and change dressings only when soiled or loosened to reduce trauma.;Does blistering severity usually improve as a person with EBS gets older?::In the most severe forms (e.g., Dowling‑Meara), blistering often lessens after early childhood, but some individuals continue to have occasional blisters. Mild localized forms may remain stable. Long‑term outlook depends on the specific genetic subtype and how well skin is protected from trauma.;
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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