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Lichen planus and lichenoid secondary syphilis share several attributes histopathologic, among those being a lichenoid infiltrate composed largely of mononuclear inflammatory cells in company at times with melanophages, vacuolar alteration along the dermoepidermal junction, and an acanthotic, hyperkeratotic epidermis. Findings that enable differentiation of lichen planus from lichenoid secondary syphilis are an infiltrate made up […]