Lichen planus
Lichen planus (LP) is a and disease that affects the skin, nails, hair, and . It is not an actual lichen, but is named for its appearance. It is characterized by polygonal, flat-topped, violaceous papules and plaques with overlying, reticulated, fine white scale, commonly affecting dorsal hands, flexural wrists and forearms, trunk, lower legs, and oral . The hue may be gray-brown in people with darker skin. Although there is a broad range of LP manifestations, the skin and oral remain the major sites of involvement. The cause is unknown, but it is thought to be the result of an autoimmune process with an unknown initial trigger. There is no cure, but many medications and procedures have been used in efforts to control the symptoms.
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