The 12-year-old girl forehead long closed mouth acne is mostly caused by too much sebum, endocrine disorders and other reasons, usually need to develop good habits, pay attention to keep clean, the use of Vitamin A cream and other drugs external treatment. The 12-year-old girl forehead long closed mouth acne is mostly due to puberty secretion of excessive sebum in the hair follicle mouth accumulation of excessive, or poor diet, sleep irregularity caused by endocrine disorders and other reasons. At this time, you should learn to reasonably clean the skin, to avoid excessive thickness of the stratum corneum and so on. Daily diet should pay attention to eat less sweets and stimulating food, keep enough sleep. Can be used under the guidance of the doctor adapalene gel, Vitamin A acid cream, peroxybenzoyl and other drugs with sterilization and dissolution of keratin effect, the child forehead acne for local topical, can have a certain effect on the elimination of acne. In addition to the usual attention to strengthen the skin cleaning and care, the emergence of closed mouth acne, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to carry out the appropriate treatment.