Un liquen plano es una enfermedad inflamatoria poco común que afecta la piel y la mucosa oral, de causa desconocida aunque pueden estar asociados a una reacción alérgica o inmunitaria y por lo general causa picazón.

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Lichen planus (LP) is an uncommon disease of the skin with a prevalence reported between 0.1–0.3% in men and women respectively. 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 in efforts 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.

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