The causes of acne around the mouth may be caused by sebum overproduction, incorrect skincare, and poor living and eating habits. 1. Excessive sebum secretion: the skin around the mouth secretes a lot of oil, the pores are blocked by oil, it is easy to grow pimples, you need to pay attention to daily facial cleaning. 2. Incorrect skincare: The skincare products or cosmetics used are irritating to the skin, and over-cleaning the skin hurts the stratum corneum, making it easy to grow acne. 3. Bad living and eating habits: daily dietary intake of large amounts of dairy products, fried foods, high sugar cakes, sugary drinks, etc., easy to cause the skin to secrete a lot of oil. In addition bad habits such as overwork, staying up late, excessive mental anxiety, etc. can also cause acne around the mouth. Improve bad dietary and living habits, if not improved to be treated with medication under the guidance of a doctor.