Itchy pimples on the back may be due to folliculitis, allergic skin diseases, eczema and other causes. It can be treated with medication, physical therapy and lifestyle improvement. 1. Folliculitis: mainly because of the follicles sebaceous gland secretion and discharge of poor secondary bacterial infection caused by the patient due to the stimulation of inflammation, red papules can appear, and can be accompanied by a sense of itchiness, which can cause the phenomenon of itchy acne on the back. Mupirocin ointment or fusidic acid ointment can be used externally, usually pay attention to local hygiene and cleanliness, light diet, regular work and rest can be. 2. Allergic skin disease: is a class of common dermatological diseases, is an allergen through the skin mucous membrane contact, inhalation, injection and ingestion and other ways into the human body, caused by an abnormal immune response. Due to the body’s immune response, the patient can appear pimples, and itching feeling strong, which can appear back acne itchy phenomenon. 3. Eczema: It is an inflammation of the superficial dermis and epidermis caused by a variety of internal and external factors. Acute episodes, the patient can appear pimples, plaques, accompanied by obvious oozing tendency, at the same time there can be intense itching, which can appear on the back of the phenomenon of itchy pimples. Itchy back acne can also be caused by other reasons, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease and follow the doctor’s instructions for treatment, to avoid delaying the condition.