Acne on the back and chest is often considered to be a symptom of acne, folliculitis and other conditions. Patients with acne on the back and chest should visit a hospital and be examined under the guidance of a doctor. 1. Acne: Acne, also known as pimples and zits. The disease mainly occurs on the cheeks, but can also involve the forehead, back and shoulder blades. In the early stages, patients may present with conical pimples consistent with hair follicles, such as whiteheads and blackheads. Gradually, inflammatory papules may form, and small pustules may appear at the top. The treatment starts with choosing the right cleansing products, controlling oil and moisturizing, and then applying anti-inflammatory drugs such as clindamycin ointment and adapalene gel externally, or applying drugs such as retinoic acid cream and azelaic acid externally to the affected area to remove the keratin plugs, thus treating acne. 2. Folliculitis: Folliculitis is usually caused by bacterial and fungal infections, commonly seen in Staphylococcus aureus and Malassezia. Patients are mainly manifested as red papules and pimples centered on hair follicles, which may be accompanied by itching, pain and other symptoms. Treatment is based on topical medications, such as topical mupirocin ointment, fusidic acid cream, erythromycin ointment and other drugs to kill bacteria and reduce inflammation. Back and chest acne has other causes (such as boils), the patient should go to the hospital in time, under the guidance of the doctor for regular treatment, do not self-medication.