Small bumps on the back may be diseases such as cornual rash, eczema, folliculitis, infectious molluscum contagiosum, etc. They can be treated by daily care and applying medication under the guidance of a doctor, but the specific treatment methods are different because of the different causes of the disease. 1. Corn Rash: Also known as prickly heat, it is caused by the blockage of sweat ducts. It is easy to develop prickly heat due to the hot environment and the lack of breathability of the clothes worn by the patient. Glycerine lotion can be used to apply on the back to astringent and relieve itching. 2. Eczema: The cause of the disease is not yet clear, and it may be related to heredity, contact with allergens and mental stress. Eczema can appear on the back of the red spots, pimples, etc., through the use of topical glucocorticoid ointment, oral antihistamines and other anti-allergy, anti-itching treatment. 3. Folliculitis: It is often caused by pathogens infecting the hair follicles and the surrounding tissues, and the common pathogens include bacteria and fungi, etc. It can be treated by applying topical mupirocin ointment or miconazole cream to fight infection, and oral antibiotics or anti-fungal medication is needed when the condition is serious. 4. infectious molluscum contagiosum: often caused by infectious molluscum contagiosum virus infection, common in children, teenagers and adults can also occur. It is often treated with wart pinching and removal, or topical application of imiquimod or cidofovir if necessary. No matter what kind of disease caused the back pimples, patients need to pay attention to personal hygiene, keep the skin clean, change clothes. It is recommended that patients go to a regular hospital to check the cause of the disease and follow the doctor’s instructions after a clear diagnosis.