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Erythematous papules of acne vulgaris and of rosacea have in common localization mostly to the face, suppurative infundibulitis, and a mixed infiltrate of inflammatory cells in the dermis, it containing lymphocytes and plasma cells, and sometimes histiocytes in clusters (granulomas). In times past, rosacea was known as acne rosacea. Differentiation histopathologic between the two seemingly […]