You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is False about Lichen planus is and explain in detail?
(A) Found in skin except mucosa# LICHEN PLANUS:> Common disorder, usually of middle aged, who present with an irritating rash affecting flexures of wrist & forearms, trunk & ankles & with an unknown etiology> Important features are severe itching and oral involvement> 5 'P's of Lichen Planus are Pruritic, Purple, Polygonal, Flat top, Papular lesion> Rash consists of discrete purple, shiny polygonal papules with fine white lines passing through them (Wickham striae) often occurring in scratch marks & other sites of injury (Koebner's phenomenon).> Hypopigmentation In residual disease is not seen Pterygium of nail (hypertrophy of eponychium) is important feature (10%) Histopathology shows hyperkeratosis, irregular acanthosis, band like dermal infiltrate of lymphocyte adjacent to the epidermis & damage to the epidermal basal cells. Dermis infiltrates with T-cells Civatte bodies/Colloid bodies (necrotic keratinocytes in dermis) are seen. Usually resolves within 6 months but recurrences may occur, resolve in 9-18 months.> Main histological features of LP is Basal cell degeneration, Civatte bodies, Max Joseph's space - Melanin incontinence; Others - Mononuclear infiltration of upper dermis.