Penicillin-induced anti-p200 pemphigoid: an unusual morphology.

We report here a case of a 52-year-old woman with erythema gyratum repens-like lesions appearing during anti-p200 pemphigoid, probably induced by oral penicillin. The diagnosis of anti-p200 pemphigoid was made by the presence of in vivo bound and circulating IgG anti-basement membrane zone auto-antibody reactive with the dermal side of salt-split skin and with 200 kDa protein in dermal extract on Western immunoblot. Laser scanning confocal microscopic study disclosed the localization of IgG at the lamina lucida-lamina densa border. Skin lesions responded poorly to high dose of prednisone and the combination of prednisone and dapsone. When methotrexate was added, skin lesions healed within 3 weeks. To our knowledge, erythema gyratum repens-like lesions have not been described previously in this disorder. Thus, we have expanded the clinical morphological spectrum of patients with anti-p200 pemphigoid and first described a patient whose disorder was probably drug-induced.