<prompt> This is seen commonly inSLELichen planusPsoriasisLeprosy  <response>: Surface of the papules in lichen planus often reveals a network of grey lines Wickhams striae. Typically seen in oral mucosa Oral lichen planus LIE-kun PLAY-nus is an ongoing chronic inflammatory condition that affects mucous membranes inside your mouth. Oral lichen planus may appear as white, lacy patches; red, swollen tissues; or open sores. These lesions may cause burning, pain or other discomfo. Ref: Harrison 19e pg: 349 