There are many reasons for back acne, clinically more common are mainly the following: first, endocrine disorders, back skin oil secretion imbalance, no timely cleaning of the skin leading to local pore blockage, skin residues can not be discharged, secretions become sticky, fat accumulation of acne. Second, fungal infection, Malassezia folliculitis is due to Malassezia infection caused by back acne, you can use ketoconazole lotion cleaning, you can also take oral antifungal drug treatment. Third, often eat spicy, greasy, stimulating food, such as barbecue, hot pot, spicy hot, often stay up late, tired will lead to abnormal oil secretion leading to back acne. Fourth, due to excessive sweating, not able to clean up in time leading to bacterial growth, pay attention to diligent bathing, wear loose clothing.