Back acne can be treated with retinoid ointment if it is clear that it is acne, and the specific medication should be prescribed by the doctor. Vitamin A ointment has an anti-inflammatory effect, but also can induce epidermal hyperplasia, mainly used for flat warts, acne vulgaris, mucous membrane white spots, hair erythema, follicular keratosis and psoriasis adjuvant treatment. If the back acne is common acne, it can usually be treated with retinoic acid ointment. Back acne may also be folliculitis, a condition for which retinoid ointment is not suitable. The drug is contraindicated in the eyes, women within the first 3 months of pregnancy, breastfeeding women, those who are allergic to the product. Adverse reactions associated with skin irritation, such as burning sensation, erythema and flaking, may occur with topical application of the product, usually suggesting that the drug is working, and usually do not require special treatment, and can be subsequently adapted and tolerated by most patients. Specific drug use regarding retinoic acid ointment should be under the guidance of a specialist, not unauthorized use.