Lichen planus is a disease in which there is an itchy rash on the skin or in the mouth.
The exact cause of lichen planus is unknown. However, it is likely to be related to an allergic or immune reaction.
Lichen planus generally affects middle-aged adults. It is less common in children.
Habif, Thomas P. Clinical Dermatology. 5th ed. Philadelphia, Pa: Mosby Elsevier;2009:pp 320-326.
Mirowski GW, Mark LA. Oral disease and oral-cutaneous manifestations of gastrointestinal and liver disease. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 9th ed. Philadelphia, Pa: Saunders Elseiver;2010:chap 22.
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