Lichen Planus , is a chronic, autoimmune, inflammatory disease which may affect skin, oral mucosa, genital mucosa, scalp, and nails. It mainly occurs among female gender and the age of onset is usually between third and sixth decade. Several factors have been proposed for the etiology including genetic background, dental materials (amalgam, metals, gold) drugs (especially anti malarials, cardiovascular agents, gold salts, non-steroidal anti-inflammatory drugs, hypoglycemic), infectious agents (herpes simplex virus, Epstein-Barr virus, cytomegalovirus, herpes virus-6, hepatitis-C virus, and human papilloma virus), autoimmunity, immunodeficiency, food allergies, stress, habits, trauma, diabetes and hypertension, malignant neoplasms, and bowel disease. Even though OLP may affect any part of the oral mucosa, most commonly affected areas are dorsum of the tongue, buccal mucosa, and gingiva.