Among our patients treated with very high doses of PUVA (more than 1,500 J/cm2) for recalcitrant disseminated psoriasis, three developed squamous-cell carcinoma of the genitalia. The tumors were located on the scrotum in all patients; one of them displayed three times running a carcinoma of the dorsal aspect of the penis. All these genital tumors arose more than 2 years after PUVA cessation, in patients with previous arsenic and tar treatment.