Acne is a chronic inflammatory skin disease of the follicular sebaceous gland units, mainly occurring in adolescents. The occurrence of acne is mainly closely related to excessive sebum secretion, blockage of follicular sebaceous gland ducts, bacterial infection and inflammatory reaction. Types of acne 1, papular: the rash is mainly inflammatory pimples, usually the size of a grain of rice to green beans, dark red, slightly pointed and hard at the tip, some pimples can have blackheads in the center of the pimples, which is more common in China. 2, pustular acne: the rash is mainly pustular, mostly located in the top of the papules, often due to inflammation, but also due to pus infection and formation. 3.Nodular acne: the location of the damage is deeper, can be elevated above the skin surface as a hemispherical bulge, or not elevated above the skin surface, palpation with the hand can be touched, usually purple or dark red, and can be gradually absorbed or pus breaks out to form a scar. 4, cystic acne: lesions for the size of the cysts, due to the sebaceous follicle mouth is blocked, the contents of the liquefaction of necrosis and the formation. Sometimes it can be infected by pus-filled bacteria, and pus flows after rupture, which often remains unhealed for a long time. 5, polymerization of acne: the vast majority of the occurrence of male, female rare. The distribution of lesions is mainly on the chest, back, shoulders and the back of the neck, and can also occur on the face and buttocks. The rash is pimples, papules, pustules, nodules, cysts, often forming large abscesses, connecting with each other, forming sinus tracts, often draining pus, and not healing for a long time. After healing, a scar or keloid is often formed into a disfiguring tissue defect. Aggregation may occur on the basis of a particular constitution (e.g., keloid constitution), or it may be associated with secretory abnormalities and immunologic deficiencies. The course of the disease is slow, often prolonged and persistent into adulthood, treatment is difficult, and healing is poor. 6, keloid: primary damage is most large acne, later due to pus bacteria, especially staphylococcal infection caused by folliculitis and perifolliculitis, healing leads to keloid hyperplasia to form most of the keloid, most common in the back of the neck area. 7, malignant pathology: lesions with papules, pustules, nodules, etc., occurring in the body especially weak, long course of the disease, often for a long time. 8, violaceous: a rare ulcerative with acute onset and systemic symptoms. Occasionally in young men, the onset of acute, skin lesions for nodules, cysts, ulcers, inflammation, and accompanied by arthralgia, muscle pain, fever, leukocytosis, blood sedimentation fast and other systemic symptoms and signs. The lesions leave scarring after healing. The following ten reasons are the main causes of acne, we must be careful to prevent 1, drinking alcohol: alcohol will make the blood become weak acidic, indirectly causing acne problems, drinking alcohol will accelerate blood circulation, detonation of acne. 2. The sun: Being exposed to direct sunlight not only causes UV damage, but also activates the secretion of sweat glands and sebaceous glands, blocking pores and accelerating inflammation. So make sure you protect yourself from the sun. 3. The disinfectant and bacteria in swimming pools can irritate the skin, so avoid swimming when you have acne. 4, facial massage can promote blood circulation, but there is inflammation on the face of the acne will be due to massage deterioration or even infected with more bacteria, so the face full of acne is better not to do beauty massage. 5, fried food: fried food oil, if the oil secretion process is blocked or bacterial infection, will grow acne. 6, hair easily covered with dirt and grease, cover the face will make the face oil on the gas. 7. Inflammatory acne will worsen if it is closed. If the acne is already pus-filled, tearing off the adhesive tape will strain the wound and leave scars. 8, thick powder cosmetics: will block the breathing of the pores, and the powder particles will be mixed with the oil and bacteria, making acne worse. 9, sauna: sauna and beauty salon steam helps blood circulation, but in the face full of acne or do not steam good, will aggravate the full range of outbreaks of acne. 10, iodine: heavy iodine-containing foods (such as seaweed) should be eaten sparingly during acne outbreaks.