Acne is generally referred to as acne, and acne on the back of boys may be related to abnormal hormone secretion, pathogenic bacterial infection, and blockage of follicular opening. 1. Abnormal hormone secretion: When the patient’s body androgen level increases, it can make the sebaceous glands increase in size, increase the secretion of oil on the face, and the oil and the shedding of dead skin cells block the pores, which may lead to the formation of acne. 2. Pathogenic bacterial infection: When the patient is infected with P. acnes, the bacteria may exist in the hair follicles and sebaceous glands of the skin, and the fatty acids and other components within the sebum are suitable for the growth and reproduction of Propionibacterium acnes, thus forming acne and causing acne. 3. Blocked follicular opening: Abnormal keratinization of the cells around the skin of the patient’s back can lead to the follicular opening becoming smaller, narrower and blocked, so sebum can not be discharged normally, and can accumulate in the follicular opening to form acne. In life, pay attention to keep the skin clean, do not scratch the affected area with your hands, and eat a light diet, avoiding spicy and stimulating foods, greasy foods, sweets, and so on. It is recommended that patients seek timely medical attention to identify the cause and follow the doctor’s instructions to avoid aggravation of acne.