Appearance of Lupus erythematosus in a Patient with Lichen planus Treated by Isoniazide

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Abstract
We hereby present a case report of a patient suffering from lichen planus and who, while under treatment with isoniazide, developed skin lesions and serologic abnormality which were typical of lupus erythematosus. Laboratory data and course of the disease indicate that drugs play a role in the pathogenesis of the disease. The nature of relationship between lichen planus and lupus erythematosus is discussed.