Lichen planus - Definition

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Lichen planus is a skin disease affecting preferentially forearms, elbows, wrists, knees, or the oral cavity. Flat brown patches, covered with a whitish part, of various sizes cover these body parts, entailing significant itching. In the mouth, lesions are on the inside of the cheeks, gums, or tongue, and are distinguished by the fact that they do not itch, but can sometimes be painful. The progression of cutaneous lichen planus is usually self-healing in a few months. For oral lichen, it can recur and can sometimes be the cause of a precancerous lesion.