Localized pemphigoid simulating dyshidrosiform dermatitis.

A patient had a localized, persistent vesicular eruption of the feet that was clinically identical to dyshidrosiform dermatitis. Direct and indirect immunofluorescent studies revealed a bullous pemphigoid (BP) pattern. Antibody blocking experiments showed the patient's circulating basement membrane zone antibody to be identical to that of classical BP. Possible pathogenetic mechanisms of localized BP are discussed.