History: A 51 year-old white male stated that he had been an Arizona cotton farmer for the past 35 years. Recently, he noted the development of a thin scaling tendency, which could easily be picked off. An occasional area of superficial ulceration would develop but readily healed within two weeks.

Clinical: The normal color of the vermilion surface of the lower lip was replaced by an overall gray-white, glassy, smooth appearance with little delineation of the mucotaneous junction. An ulceration in a late healing stage was visible on the lower lip. Small areas of atrophy and formation of thin brownish scales in random distribution were visible.