Statistical data on lichen planus are scanty. The latest review that could be found in the literature dates back to 1919 to a symposium held on this disease in the 42d annual meeting of the American Dermatological Association. At this symposium papers containing such data were read by Little,1White,2and Culver.3 Little1reported on a total of 270 cases, of which 171 (63%) were females; White2reported on a total of 64 cases, of which 38 (60%) were females, and Culver3reported on 148 cases, of which 82 (55%) were males. No specific etiologic factor could be determined from their material. There was, however, general agreement that lichen planus affects largely the educated and sedentary classes, and appears in the fourth and fifth decades of life. Initial lesions were said to appear most frequently on the flexor surfaces of