Teenagers often have acne is a normal phenomenon, indicating the high metabolism of the body, before the age of 30, most teenagers are prone to acne. The main factors are genetic factors, seborrheic dermatitis and acne due to blockage of skin pores by cosmetics. If the acne grows in the lips of the mouth, the sides of the nose, the dangerous triangle under the lips of the mouth do not squeeze, because squeezing can cause infection, close to the cranium is prone to intracranial infection and dangerous. Eat light food when you have pimples, eat less sweets and meat, and you can wipe with local anti-inflammatory drugs. If the acne continues to grow you should check thyroid hormone and testosterone for proper diagnosis and treatment.