Lichen Planus is a rare, mucocutaneous, disorder involving an itchy rash, lesions or papules -- areas of inflamed eruptions - that recurs over a period of months or years. Special forms of lichen planus include: Drug-induced lichen planus, Lupus erythematosus-lichen planus overlap syndrome, Lichen planus pemphigoide, Keratosis lichenoides chronica, Lichenoid reaction of graft-versus-host disease, Lichenoid keratosis and Lichenoid dermatits. If you or a loved one has lichen planus, this invaluable reference contains causes, tests and available treatments along with a concise reference guide.