The common causes of back acne include acne, Malassezia folliculitis, etc., which need to be treated with targeted medication according to the cause. 1. Acne: is a follicular sebaceous glands chronic inflammatory skin disease, occurring in the face, chest, back and other parts of the main pimples, pimples, pustules and other characteristics, often accompanied by sebum overflow. Local topical medications such as retinoic acid cream and benzoyl peroxide can be used as prescribed by the doctor, and erythromycin cream and fusidic acid cream can be used externally when secondary bacterial infections occur. If the symptoms are serious, oral drugs such as isotretinoin can be applied. 2. Malassezia folliculitis: it is a skin disease caused by Malassezia infection, which occurs on the back, chest and other parts of the body, manifested as dense or scattered hemispherical papules or pustules on the skin surface, often accompanied by itching. You can use topical ketoconazole cream and terbinafine hydrochloride cream as prescribed by your doctor, and if the symptoms are severe, you can apply oral medications such as fluconazole capsules and itraconazole capsules. Back acne may have other causes, it is recommended that patients go to the hospital in a timely manner, a clear diagnosis, follow the doctor’s instructions standardized treatment.