Acne Related Terms Acne mechanica, acne vulgaris, blackhead, chloracne, Clostridium difficile, clindamycin, comedones, cyst, epidermoid cyst, erythromycin, nodule, papules, pseudomembranous colitis, pimples, Propionibacterium acnes, pustule, scar, steroid, tetracycline, whiteheads, zits. Background Acne is an inflammatory disease of the sebaceous glands (oil producing) and hair follicles of the skin that is marked by