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Many diseases mimic lichen planus clinically and histopathologically, among them lichen planus-like keratosis, lichenoid discoid lupus erythematosus, lichenoid photodermatitis, lichenoid secondary syphilis, and lichenoid drug eruptions. Of all the drug eruptions that simulate lichen planus, that induced by injected gold is probably the most common and, therefore, will serve as the stereotype in this discussion […]