Severe infantile epidermolysis bullosa simplex. Dowling-Meara type

Area of Science:

• Dermatology
• Genetics
• Pathology

Background:

• Epidermolysis Bullosa (EB) simplex, Dowling-Meara type, is a rare blistering skin disorder.
• Accurate diagnosis is crucial for appropriate management and genetic counseling.

Observation:

• Eight patients presented with severe neonatal blistering, initially misdiagnosed as recessive dystrophic EB.
• Blistering decreased with age, but severe palm/sole hyperkeratosis developed in some older patients.
• Histological examination initially suggested subepidermal blistering in five cases.

Findings:

• Electron microscopy confirmed EB simplex by revealing basal cell cytolysis and tonofilament clumping.
• Immunofluorescence showed a cleft above the basal layer in three patients.
• Key features include neonatal blistering, milia, acral distribution, intraoral lesions, and intraepidermal clefting.

Implications:

• This subtype may be more common than previously recognized, particularly in the American literature.
• Early identification of EB simplex, Dowling-Meara type, is essential for distinguishing it from other EB forms.
• Understanding these specific clinical and ultrastructural findings aids in diagnosis and patient management.