<prompt> A 10 year old child has violaceous papule and pterygium of Nails, the diagnosis is :PsoriasisLichen PlanusPemphigusPemphigoid  <response>: Ans. is b Lichen Planus Violaceous papules and pterygium clinches the diagnosis of lichen planusImp, point about lichen planusPruritic Papular disorder involvingFlexural surfaceMucous membraneGenitaliaClinical FeaturesAge group 30-60 yrsLesions arePolygonalPlain toppedPapulesPurpleThe lesions are Symmetrical and usually effectForearm and wristsLower legs thighGenitaliaPalms and solesMucosal involvement especially the buccal mucosa occurs in 23 cases.Other characteristic features :Wickhams Striae - Delicate white lines on surface of lesionKoehler phenomenon Nail Involvement - Occurs in 10 cases pterygium, Anychia Scalp lesions - Scarring Alopecia occurs. 