Acne is not folliculitis, but acne vulgaris, a chronic, self-limiting, inflammatory disease of the sebaceous glands of the hair follicles, with the basic symptom being pimples, that is often found in young or middle-aged people. Acne vulgaris usually occurs only on the face, chest and back where sebaceous glands overflow, but can also occur on the buttocks. It commonly occurs in young or middle-aged adults, starting in puberty as the first manifestation of increased synthesis of sex hormones. Patients with acne vulgaris have the same blood levels of androgens as normal, but the sebaceous glands are more responsive to androgens. The main manifestation of acne vulgaris is pimples. Open pimples are blackheads, in which black material enters the dilated pores of hair follicles. Whiteheads, or closed pimples, are small pale white nodules with occasional redness around them. Teenagers can have significant whiteheads and blackheads acne, and as they age, they also often have papules, nodules, abscesses, scarring and keloid damage. Acne patients should go to the hospital in time, under the guidance of the doctor standardized treatment.