A subtype of junctional epidermolysis bullosa the condition occurs in childhood or young adulthood. 22 patients in 12 families have been reported to date. Blistering occurs at first around nails, accompanied by nail dystrophy and shedding, and then affects the hands and feet and, to a lesser extent, the elbows, knees, along with atrophic scarring. Other manifestations include disappearance of dermatoglyphs and palmoplantar hyperhidrosis. Extracutaneous involvement is restricted to soft tissue abnormalities of the oral cavity and enamel defects with development of caries. COL17A1 mutations have recently been described in an affected family. The condition follows an autosomal recessive pattern of inheritance. [from SNOMEDCT_US]