There are several reasons for acne under the lips: first, consider that the patient is in adolescence, hormone level secretion is more vigorous, more oil. Long-term staying up late, smoking, drinking alcohol, eating spicy and stimulating food are the reasons for acne under the lips. Second, consider whether the women’s menstruation is normal, if the amount of menstruation and the frequency of menstruation are relatively irregular, you can go to the gynecology department to check the ultrasound, to exclude the polycystic ovary syndrome caused by the case of acne under the lips. The third, facial T-zone is mainly the forehead, the frontal bone and the T-zone around the chin, which normally has more sebum secretion and is an important reason for the formation of acne.