Acne on the back may be caused by folliculitis, acne, eczema and other factors, and it is necessary to clarify the cause of the disease and then treat the symptoms as follows: 1. Folliculitis: most of the folliculitis is caused by bacterial infection, which can occur in the back, manifested as pimples and pustules centered on hair follicles, accompanied by itching and pain. Under the guidance of a doctor, you can use topical antibiotic ointment such as mupirocin ointment, oral antibiotic medication such as amoxicillin, etc., can also be supplemented with local laser treatment, serious cases develop into scabies or carbuncle, surgical incision and drainage is required. 2. Acne: Chronic inflammation of the sebaceous glands of the hair follicles due to a variety of factors, can occur in the back, manifested as pimples, pimples, pustules, nodules and so on. Under the guidance of the doctor, local application of retinoic acid drugs such as adapalene, antibiotic drugs such as clindamycin gel, etc., and oral retinoic acid drugs such as isotretinoin and antibiotic drugs such as doxycycline in severe cases, while assisted by photodynamic therapy. 3. Eczema: it is an allergic skin disease caused by many factors, can occur in the back, can be manifested as erythema, papules, papules, accompanied by itching and other symptoms, easy to recur. Glucocorticoid creams such as dianabed cream and dexamethasone cream can be applied locally under the guidance of a doctor, and oral antihistamines such as loratadine and cetirizine can be supplemented with ultraviolet light therapy such as UVA irradiation and narrow-wave UVB irradiation. If the patient has the symptom of acne on the back, it is recommended to go to the dermatology department of the regular hospital in a timely manner, and actively cooperate with the relevant examination, in order to clarify the cause of the symptomatic treatment, and to avoid self-medication, so as to avoid delaying the condition.