Back acne can be treated with retinoids and antibiotics if it is acne, or antibiotics or antifungal drugs if it is folliculitis. 1. Back pimples may be acne, usually caused by excessive oil secretion of the skin, you should pay attention to keep the back skin clean, and usually take a shower and change clothes frequently. When there are more pimples, you can use retinoids such as retinoid cream and adapalene gel to relieve them. When the pimples appear red, swollen and infected, you can apply antibiotic drugs, such as fusidic acid cream, erythromycin ointment and so on. 2. Acne on the back can also be folliculitis. Bacterial folliculitis can be treated with mupirocin ointment and fungal folliculitis can be treated with ketoconazole cream. If the back acne is serious, go to the hospital for treatment and use the above medications as prescribed by your doctor.