A lot of pimples on the chest and back without pain or itching are mostly acne or folliculitis, which may be caused by incomplete skin cleansing, endocrine disorders, etc. They can be removed through lifestyle adjustments, medication, and physical therapy. 1. Acne: Abnormal keratinization of hair follicle orifices and Propionibacterium acnes infection can cause pimples, papules and pustules on the chest and back, i.e. acne. You need to pay attention to cleanliness, reduce eating greasy food and sweets, avoid mental stress, you can use topical antibiotics such as clindamycin to fight infection, adapalene and other retinoids to dissolve pimples and improve keratinization, and photodynamic and other physical treatments to reduce the inflammation of the skin. 2. Folliculitis: chest, back oil secretion, cell metabolism of keratin easily accumulate in the hair follicles caused by blockage induced folliculitis, may be related to diet, late at night and other habits and high levels of androgen in the body. You need to pay attention to the skin clean, regular routine to avoid stimulating food to help the endocrine balance. You can use mupirocin ointment and other antibiotics or ketoconazole and other antifungal drugs to inhibit sterilization. All of the above drugs should be used in accordance with the doctor’s instructions. Patients with acne on the chest and back need to keep their skin clean in daily life, bathe and change clothes regularly, eat regularly and exercise moderately. If the symptoms persist for a long time without improvement, it is recommended to go to the regular hospital in time, under the guidance of the doctor for standardized treatment.