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lichen planus
Lichen planus (LP) is a disease of the skin and/or mucous membranes that resembles lichen. 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 different medications and procedures have been used to control the symptoms.
The term lichenoid reaction (or lichenoid lesion) refers to a lesion of similar or identical histopathologic and clinical appearance to lichen planus (i.e. an area which looks the same as lichen planus, both to the naked eye and under a microscope). Sometimes dental materials or certain medications can cause a lichenoid reaction.〔 They can also occur in association with graft versus host disease.〔
==Classification==
Lichen planus has been described as an autoimmune disease,〔 a dermatosis,〔 a papulosquamous disorder, a mucocutaneous disease, and an inflammatory disease.〔
Lichen planus lesions are so called because of their "lichen-like" appearance and can be classified by the site they involve, or by their morphology.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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