To the Editor: —I recently treated a woman for dermatitis venenata which had such an unusual cause that I thought it worth reporting. Mrs. F. S., aged 28, had an attack of acne varioliformis. She consulted her family physician, who advised her to shave her scalp. The condition improved under antiseptic ointment treatment which he prescribed. Later she consulted me for a dermatitis of the face and neck. When I first saw the patient, the hair on her scalp was about one-half inch long. A few papules of acne varioliformis were present. The dermatitis of the face and neck was evidently of external origin. After the most careful questioning as to the use of soaps, hair tonics and dyes I was unable to ascertain the cause of the condition, and it continued to reappear in spite of all treatment. I received the cooperation of the patient, who was an intelligent