A Case for Diagnosis (Linear Nevus?). Presented by Dr. R. E. Barney. Mrs. R. F., a white woman aged 27, states that her father informed her that he had noticed a dime-sized pitted area on the flexor surface of her right wrist at birth. This area had increased in size, gradually extending up the arm. Involving the flexor surface of the right wrist, chiefly on the ulnar aspect, is an area half the size of a palm in which the skin shows a noninflammatory stippling. The process extends up the ulnar aspect of the forearm in a ½ inch (1 cm.) band to the junction of the middle and upper thirds. A biopsy specimen taken from the area on the wrist showed a moderate degree of hyperkeratosis, with flattening of the rete pegs. There was atrophy of the papillary layer of the corium and moderate fibrosis of the reticular