Itchy little red bumps may be caused by contact dermatitis, eczema, hives and other causes. 1. Contact dermatitis: itchy red bumps may be caused by contact dermatitis, contact dermatitis is the patient contact with irritating substances or allergic substances occurring after the perverse reaction, the clinical manifestations of patchy rashes, pimples, blisters, mossy lesions and so on. 2. Eczema: itchy red bumps may be caused by eczema, patients will appear red spots, papules, papules, vesicles and other symptoms, and itching is intense, affecting sleep at night. 3. Urticaria: itchy red bumps may also be caused by urticaria, urticaria is due to the expansion of small blood vessels in the skin and mucous membranes and the increase in permeability of the limited edema reaction. Patients will appear itchy skin, red or skin-colored wind bumps, the size and shape of the wind bumps vary, and then gradually spread and merge into a piece. When patients have itchy small red bumps, they should go to the hospital in time, and under the guidance of the doctor reasonable treatment.