A case of pustular ulcerative dermatosis of the scalp associated with ulcerative skin lesions on the scrotum.

A 79-year-old man developed pustules, erosions, and ulcer with severe pain on the parietal regions of the scalp and the scrotum. In another hospital, mycobacterium was detected from the pustules of the scalp at Gaffky scale 1, and this patient was referred to our clinic. In our hospital, repeated cultures of the pus from the skin lesions of the scalp were negative for mycobacterium. Biopsy specimens obtained from the skin lesions on the scalp disclosed ulcerative granulation with infiltration of inflammatory cells. Antibiotics and antituberculotic agents were ineffective. In contrast, the ulcerative skin lesions on the scalp and scrotum responded well to topical and systemic glucocorticosteroids. Although this patient developed pustular ulcerative skin lesions not only on the scalp but also on the scrotum, we considered this case to be pustular ulcerative dermatosis of the scalp developing ulcerative skin lesions on the scrotum.