When teenagers have acne on their faces, the first thing to consider is acne. The onset of acne is mainly related to androgen levels and increased sebum secretion, etc. It occurs on the face and is characterized by polymorphic lesions such as acne, papules, pustules, and nodules. Adolescents have an enhanced metabolism and high androgen secretion due to the demands of physical development. The sebaceous glands produce excessive sebum, which mixes with the shed epidermal tissue to form a sediment-like substance called keratin plugs, which can block pores and cause acne flare-ups. In addition, the occurrence of acne may be related to bacterial infection, abnormal keratinization of the sebaceous ducts of hair follicles, inflammation, and other causes. Generally, with the end of puberty and the relative stability of androgen production in the body, acne can often be naturally reduced or cured. Teenage face acne may also be caused by mosquito bites, mosquitoes through its mouthpiece stabbing the skin, its venom into the skin, thus causing inflammation, serious local blisters can be produced, showing the local acne situation. Pimples caused by mosquito bites are often episodic, often fading on their own after a period of time, no other abnormalities in the body need no special treatment. In addition, it does not exclude urticaria, skin flab, herpes and other cases, adolescents at this time, if accompanied by other symptoms, it is recommended to seek medical advice to identify the cause, the cause of treatment.