[Psoriasis-pemphigoid association. Description of a case].

The paper describes a case of an 85-year-old woman affected by psoriasis for 30 years who developed bullous pemphigoid after UVB treatment. Immunological and histological findings were typical of bullous pemphigoid cell-poor type. Bullous eruptions cleared following combined therapy with betamethasone and azathioprine. The literature on the subject and pathogenetic hypotheses for this unusual association are discussed.