[A guest worker's multistage skin disease--a dermatologist's headache].

A Bangladeshi man had suffered for four years from dermatitis that turned out to be caused by a dermatophyte infection masked by the use of strong corticosteroid ointments. After starting internal antifungal medication he developed a painful kerion reaction in the bearded region. Two systemic corticosteroid courses were required to calm it down. After discontinuation of corticosteroids he developed extensive psoriasis.