Acne, Cystic Acne, Acne Vulgaris, comedo, papule, pustule, nodule , cyst sebaceous follicle, comedones (blackheads and whiteheads), plural comedones, sebum Acne is the term for plugged pores (blackheads and whiteheads), pimples, and even deeper lumps (cysts or nodules) that occur on the face, neck, chest, back, shoulders and even the upper arms. Acne affects most...