Acne on the back can be due to mites, or it can be related to excessive oil secretion, bacterial or fungal infections, and so on. When the mite infects the back, it can cause destruction of hair follicles and sebaceous glands, blockage of sebaceous gland secretion, and the bugs as well as their secretions can also stimulate the skin to develop an inflammatory reaction, leading to back acne, and the skin can also be mildly flushed, oily, flaky, and so on. In addition, back due to late night, do not pay attention to clean, etc. can cause excessive oil secretion, seborrheic dermatitis; staphylococcus aureus, candida albicans, malassezia and other pathogens infected with the back, etc. can cause back acne. When back acne affects the personal image, the cause can be clarified under the guidance of the doctor, and then actively standardized treatment, daily life, pay attention to change clothes, pay attention to back hygiene.