Itchy back acne can be caused by folliculitis or acne, which is mainly treated with medication and surgery. 1. Folliculitis: usually caused by bacterial infection, can be treated with antibacterial drugs, such as mupirocin ointment, fusidic acid cream, etc., can also be combined with oral amoxicillin, doxycycline, for particularly serious folliculitis, surgical treatment, such as incision and drainage. 2. Acne: usually caused by Propionibacterium acnes infection, doxycycline, minocycline and other drugs can be used for antibacterial treatment. For severe acne, surgical treatment can be performed, such as cyst incision and drainage or ionized cyst opening. In the process of treatment, we should follow the doctor’s guidance, safe and reasonable use of medication, and keep the local clean, light diet.