Itchy bumps on the back may be due to folliculitis, eczema, hives and other factors. 1. Folliculitis: folliculitis is mainly caused by bacterial and fungal infections, and can occur in any part of the body. Malassezia folliculitis occurs in the chest, upper back and other parts of the body, manifested as scattered distribution of hemispherical red pimples or pustules, with a glossy surface, surrounded by a reddish halo, and some patients may experience varying degrees of itching. 2. Eczema: is a kind of skin inflammation caused by a variety of internal and external factors, acute eczema can be manifested as erythema on the basis of the appearance of corn-sized papules, papules, blisters, often fused into a piece, the border is not clear, the self-conscious itching is intense, scratching will be the symptoms of vesicles, oozing. 3. urticaria: commonly known as “wind bumps”, “air masses”, can be spontaneous, may also be due to contact with cold, sunlight, scratches and other factors led to the performance of varying sizes of lumpy elevations, bright red or pale white, accompanied by obvious itching. Itchy bumps on the back may also be due to other factors, it is recommended that the patient seek medical attention in a timely manner, under the guidance of the doctor for relevant examinations, in order to clarify the cause of the disease, targeted treatment.