A 71-year-old man, who has been a barber for 40 years, stopped work in August, 1950, because of dermatitis of the right hand. While he was cutting hair, short bristles would frequently irritate the second interspace of his right hand. Gradually, a rash appeared at this area and spread over the hand and forearm. Examination on Sept. 25, 1950, showed marked erythema, edema, and vesiculation of the fingers of both hands. The patient said he had had no eruption elsewhere. This dermatitis responded to soothing treatment in three weeks. The patient then admitted having an ulcer on his right ankle, which had not responded to treatment by a vascular surgeon, and he requested therapy. The ulcer healed on Nov. 7. His right hand had remained well; however, a small, red, pouting sinus was seen at the right second interspace. Protruding from this sinus was a small hair; in fact, the