Lichen planus

摘要

Lichen planus is a chronic, T-cell-mediated, inflammatory disease of the skin and mucous membranes. Its classic presentation is as violaceous, flat-topped macules and papules, which favour the extremities and flexor creases. When considering the diagnosis of lichen planus, take a thorough drug history to determine whether there is an underlying drug cause before diagnosing 'idiopathic' lichen planus. Mucosal surfaces and nails should also be examined in all patients, as the disease commonly also affects these sites. This article explores the clinical presentation, investigations and management of this condition from a primary care perspective.