<prompt> A young lady present with white lacy lesions in oral cavity and her proximal nail fold has extended onto the nail bed. What is the likely diagnosis -PsoriasisGeographic tongueLichen planusCandidiasis  <response>: In lichen planus there is mucosal involvement - White, reticulated, Lacey pattern on the buccal mucosal, tongue and gingiva. Nail changes include thinning of nail plate, trachyonychia same paper nails , tenting of nail platespup tent sign and pterygium proximal nail fold is prolonged on to the nail bed , splitting and destroying nail plate. IADVL textbook of dermatology , page 1070 