<prompt> Wickhams stria seen in-lichen niditusLichenoid eruptionLichen striatesLichen Planus  <response>: LICHEN PLANUS:- Inflammatory T cell mediated auto immune disorder affecting skin, hair,nails and mucous membranes.Four Ps- purple , polygonal and pruritic papule.Classic lesion- small polygonal shaped, and red violet, flat topped papule. Surface is slightly shiny transparent,and a network of fine,white lines called Wickhams striae , small grey white puncta is also seen. IADVL textbook of dermatology PAGE 1070 