<prompt> A male is presenting with a violaceous papule which is pruritic. There is pterygium of nail with cicatracial alopecia. Diagnosis isPsoriasisPityriasis roseaLichen planusSeborrheic dermatitis  <response>: Information we got :-Lesion is pruriticNo scalesViolaceous papulePterygium of nailCicatracial alopeciaAll are seen in Lichen planus. 