OBSOLETE: Basal epidermolysis bullosa simplex

Basal epidermolysis bullosa simplex (basal EBS) is an obsolete clinical designation that was previously used to describe a subgroup of epidermolysis bullosa simplex (EBS) in which skin blistering occurs due to fragility at the basal layer of the epidermis. Epidermolysis bullosa simplex is a group of inherited skin fragility disorders characterized by blistering of the skin and sometimes mucous membranes in response to minor mechanical trauma. In basal EBS subtypes, the cleavage plane is located within the basal keratinocytes, distinguishing it from suprabasal forms. Historically, this category encompassed several specific subtypes including EBS with muscular dystrophy (due to plectin deficiency), EBS-Ogna, and other forms linked to mutations in genes such as KRT5, KRT14, PLEC, and EXPH5. This Orphanet entry (ORPHA:158665) is now classified as obsolete, meaning the terminology has been retired and the conditions previously grouped under this label have been reclassified into more specific diagnostic entities according to updated international consensus classifications of epidermolysis bullosa. Patients who were previously diagnosed with basal epidermolysis bullosa simplex should consult their dermatologist or clinical geneticist to determine the current classification of their specific condition. Key symptoms across the former basal EBS subtypes included skin blistering from birth or early infancy, erosions predominantly on trauma-prone areas such as the hands and feet, and in some subtypes, additional features such as progressive muscular dystrophy or nail dystrophy. Treatment remains largely supportive, focusing on wound care, blister management, infection prevention, and pain control, as no curative therapy is currently available.

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