Small bumps like pimples on the chest may be caused by folliculitis, allergies, acne, etc. They can be treated with topical and oral medications, etc. 1. Folliculitis: Folliculitis occurs when the sebaceous glands secrete exuberantly and are not cleaned properly, leading to blockage of the hair follicles. So small bumps like acne on chest can be treated with medicines like fusidic acid cream and mupirocin ointment. 2. Allergy: The contact with allergens may lead to acne-like bumps on the chest, accompanied by itching. You should get rid of the allergens immediately, and can follow the doctor’s instructions to use mometasone furoate cream and oral loratadine tablets and other drugs for treatment. 3. Acne: acne is caused by skin infections, endocrine disorders and other reasons, so there are small bumps like pimples on the chest. Topical treatments usually include red and blue light irradiation, oral minocycline hydrochloride, and topical fusidic acid cream. Do not scratch with your hands when you have acne-like bumps on your chest, pay attention to personal hygiene, and avoid spicy and stimulating foods. There are many reasons for similar symptoms, which should be treated according to the cause. It is recommended to go to the hospital in time, by the professional doctor for standardized diagnosis and treatment. Drugs should also be used in accordance with medical advice to avoid adverse consequences.