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acne vulgaris (akŽne vul-garŽis)   a chronic skin disorder usually seen in adolescents and young adults, in which there is increased production of oil from the sebaceous glands with formation of comedones (blackheads and whiteheads) that plug the pores. Noninflammatory types produce plugged follicles and a few pimples. Inflammatory types are characterized by many pimples, pustules, nodules, and inflamed cysts. The lesions are most often found on the face, neck, chest, back, and shoulders.




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