| Definition of 'lichen planus' |
Princeton's WordNet |
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1. (noun) lichen planus, lichen ruber planus
an eruption of shiny flat-topped purplish (usually itchy) papules on the wrist and forearms and thighs
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| Definition of 'lichen planus' |
U.S. National Library of Medicine |
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1. lichen planus
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.
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Definitions of lichen planus 
