Erythema Perstans

SUMMARY.— A review of the clinical features of 113 and the histological features of 42 patients with erythema perstans is presented. In none of the patients was a cause definitely established. Seven patients had an internal malignancy. In only 3 of the 7 was there a temporal relationship between the malignancy and the erythema perstans such that an aetioiogical relationship could be seriously considered. Six patients in a control group of 113 patients with psoriasis had an internal malignancy. Erythema perstans may sometimes be a sign of internal malignancy, but the present study indicates that this is true less often than previously suspected.