Practice Essentials
Epidermolysis bullosa (EB) is a group of inherited bullous disorders characterized by blister formation in response to mechanical trauma. Historically, epidermolysis bullosa subtypes have been classified according to skin morphology. [1, 2]
Discoveries of the molecular basis of epidermolysis bullosa have resulted in the development of diagnostic tools, including prenatal and preimplantation testing. Based on a better understanding of the basement membrane zone (BMZ) and the genes responsible for its components, newer treatments (eg, gene or protein therapy) may provide solutions to the skin fragility found in patients with epidermolysis bullosa.
Related articles include Epidermolysis Bullosa Acquisita and Pediatric Epidermolysis Bullosa.
Signs and symptoms
Important general points include age of onset; size, frequency, and location of blisters; possible inciting factors; prior diagnostic attempts; prior therapies; and extent of pain or pruritus.
Review of systems information that can be associated with different epidermolysis bullosa (EB) subtypes includes alteration of growth or development and evidence of mucosal involvement, including oral (which is demonstrated in the image below), nasopharyngeal, ocular, genitourinary, GI, or respiratory symptoms. A family history of blistering disease is an important finding to identify.
Perform a complete physical examination with an emphasis on inspection of all skin, as well as conjunctival, oral, and genital mucosae.
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Epidermolysis bullosa simplex localized (formerly termed Weber-Cockayne subtype). This mild bullous disease is characterized by localized blistering at sites of trauma such as the feet.
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Epidermolysis bullosa simplex, generalized (formerly termed Koebner subtype). Palmoplantar blistering and hyperkeratosis are noted.
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Epidermolysis bullosa simplex, generalized (formerly termed Koebner subtype). Close-up image shows hyperkeratotic papules and plaques on the palm.
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Junctional epidermolysis bullosa, generalized severe (formerly termed Herlitz or letalis) subtype. This severe disease is characterized by generalized intralamina lucida blistering at birth, significant internal involvement, and a poor prognosis.
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Dominantly inherited dystrophic epidermolysis bullosa. The blistering in this disease often is localized and is characterized by scarring and milia in healed blister sites.
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Dominantly inherited dystrophic epidermolysis bullosa. This subtype, similar to other dystrophic and junctional epidermolysis bullosa subtypes, can result in nail dystrophy and loss.
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Recessively inherited dystrophic epidermolysis bullosa pseudosyndactyly (mitten-hand deformity) of the hands and feet.
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Recessively inherited dystrophic epidermolysis bullosa; oral cavity blistering and scarring.
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Recessively inherited dystrophic epidermolysis bullosa; squamous cell carcinoma.
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Diagram illustrating the organization of the dermal epidermal basement membrane and level of disruption in epidermolysis bullosa subtypes. EBS: epidermolysis bullosa simplex. JEB: junctional epidermolysis bullosa. DEB: dystrophic epidermolysis bullosa.