The appearance of folliculitis on the back may be caused by bacterial and fungal infections, which can usually be treated with antibiotic and antifungal topical ointments, such as mupirocin ointment and ketoconazole cream. 1. Bacterial folliculitis: Staphylococcus aureus is the most common pathogen. Commonly used antibiotic topical ointment mupirocin ointment, fusidic acid cream, compound polymyxin B ointment, etc., if necessary, oral antibiotics such as cefprozil. 2. Fungal folliculitis: pathogens common Malassezia, etc., topical ointment can be used ketoconazole cream, miconazole cream, clotrimazole cream, etc., if necessary, oral antifungal drug itraconazole. Patients with folliculitis on the back are advised to seek medical attention in a timely manner and use antibiotic and antifungal topical creams under the guidance of a doctor, without authorization.