Lichen Planus

Definition 1

A chronic, recurrent, pruritic inflammatory disorder of unknown etiology that affects the skin and mucus membranes. It presents with rashes and papules that tend to resolve spontaneously. It may be associated with hepatitis C. Certain drugs that contain arsenic or bismuth are associated with reactions mimicking lichen planus. (NCI Thesaurus)

Definition 2

An inflammatory, pruritic disease of the skin and mucous membranes, which can be either generalized or localized. It is characterized by distinctive purplish, flat-topped papules having a predilection for the trunk and flexor surfaces. The lesions may be discrete or coalesce to form plaques. Histologically, there is a "saw-tooth" pattern of epidermal hyperplasia and vacuolar alteration of the basal layer of the epidermis along with an intense upper dermal inflammatory infiltrate composed predominantly of T-cells. Etiology is unknown. (NLM, Medical Subject Headings)

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