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What is lichen planus?
Lichen planus is a chronic recurrent rash that is due to inflammation in the skin and mucous membranes. The rash is characterized by small, flat-topped, many-sided (polygonal) bumps that can grow together into rough, scaly plaques on the skin. There may also be a rash in the lining (mucous membranes) of the mouth or vagina.
Lichen planus is a poorly understood skin condition. Its name is descriptive in that to some it resembles a simple plant, a lichen,
which grows on rocks and tree bark, while
planus is Latin for flat.