Acne on the back and chest may be related to Malassezia folliculitis, acne vulgaris or acne vulgaris, etc. Treatments include general treatment, topical medication or systemic application of medication. 1. General treatment: In daily life, it is recommended to bathe and change clothes frequently, reduce the intake of spicy, fried, sweet or greasy food, ask for allergy history carefully before using medication, avoid abusing medication, and avoid pinching and squeezing the skin lesions with hands after acne growth. 2. Topical medication: If it is Malassezia folliculitis, you can use antifungal topical preparations such as ketoconazole cream. Acne-type rash can be treated with topical glycerin lotion or glucocorticoid cream such as dieldrin, etc. Acne vulgaris can be treated with topical retinoic acid cream or retinoic acid solvent. 3. Systemic drug therapy: Malassezia folliculitis lesions are large in size, and oral antifungal drugs can be used if the simple external treatment is not effective. Acne-type drug rash, can be given antihistamines, vitamin C or calcium, etc.; common acne can be used internally isotretinoin, antibiotics such as minocycline and other drugs. There are many reasons for acne on the chest and back, it is recommended to go to the hospital specialist in time, after clarifying the cause of the disease, follow the doctor’s prescription treatment, avoid self-medication.