Acne here refers to the growth of red bumps. Acne is related to acne, folliculitis, contact dermatitis and other diseases, and its treatment includes general treatment, medication and so on. 1. Acne: For acne-induced back acne, patients should not pick and scratch the affected area, and can apply retinoids, including adapalene gel and tazarotene gel, to facilitate the removal of pimples, anti-inflammatory and so on. In addition, you can also use topical benzoyl peroxide, azelaic acid and other drugs to help inhibit Propionibacterium acnes and improve the back. 2. Folliculitis: If acne on the back is caused by folliculitis, patients should pay attention to skin cleaning. For folliculitis caused by bacteria, you need to apply antibiotic drugs such as clindamycin gel and fusidic acid ointment to facilitate the removal of germs; if it is caused by fungi, you need to apply antifungal drugs such as econazole and terbinafine to promote the recovery of the affected area. 3. Contact dermatitis: due to contact with some easily sensitized or irritating items after the occurrence of perverse reactions, can also lead to back acne, accompanied by itching, tingling sensation. At this time you need to clarify the cause and get rid of, external glycerine lotion, mometasone furoate, zinc oxide and other ointments, combined oral antihistamines such as loratadine, hormonal drugs such as prednisone and so on. The causes of acne behind the back are not unique, it is recommended that patients go to a regular hospital, with the doctor for standardized treatment. The medication should be used in accordance with the doctor’s instructions.