Acne on the back may be a manifestation of acne, folliculitis, and other diseases, and should be removed by medication (erythromycin ointment, etc.), physical therapy, or surgery, depending on the cause. 1. Acne: Inflammatory papules, pustules, nodules, etc. may appear on the back. You need to adjust your mind, eat a light diet, and keep your back area dry and clean. You can apply Vitamin A cream, Adapalene cream and other medications to treat it, and take oral isotretinoin and other medications if necessary. 2. Folliculitis: manifested as red, swollen and raised hair follicles with white pus spots at the tips. Apply ichthyol ointment, erythromycin ointment, mupirocin ointment and other medications. Far-infrared rays and ultra-short wave treatment can be used if necessary. If the folliculitis has broken, incision and drainage treatment is needed. Patients should consult a doctor in time, do a systematic examination and diagnosis, and then strictly follow the doctor’s instructions for medication.