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Lichen planopilaris (LPP) is an uncommon inflammatory scalp disorder which is clinically characterized by perifollicular erythema, follicular hyperkeratosis, and permanent hair loss. LPP is considered a follicular form of lichen planus based upon shared pathologic features and the frequent coexistence of clinical findings of these disorders.
Lichen planopilaris typically presents as smooth white patches of scalp hair loss. No hair follicle openings can be seen in the areas of hair loss. At the edges of these patches there may be scale and redness around each hair follicle. Hairs can be easily pulled out. It is multifocal and small patches may merge to form larger irregular areas. lichen planopilaris is rare, it is one of the common causes of scarring hair loss of the scalp.