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Key Points Lichen planus (LP) is a pruritic eruption that may be self-limited or chronic, and may affect skin, mucosa (including the esophagus), and hair. The classic morphology of lichen planus is violaceous-to-purple, flat-topped polygonal papules, often with a white-to-lavender reticulate overlying scale (Wickham’s striae). They may occur in areas of prior trauma or injury […]