Oral lichen planus occurs in about half of the people who have lichen planus on their skin. It consists of painless, whitish streaks on the mucous membranes. This may also produce ulcers, which are usually painful.
Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.