Lichen sclerosus and immunobullous disease.

We report 3 patients with long-standing lichen sclerosus who subsequently developed new onset erosive disease in affected sites. Repeated biopsies were performed which, although not diagnostic, showed some features of bullous pemphigoid for 1 patient and nonspecific findings for the 2 others. Direct immunofluorescence showed the characteristic findings of bullous pemphigoid in the first and pemphigus vulgaris in the others. All 3 patients were treated with immunosuppressive agents, and their condition improved dramatically.