Small itchy red bumps on the body may be caused by hives, insect bite dermatitis, eczema and other reasons. 1. Urticaria: Urticaria is usually related to allergy, immunity, infection and other reasons, there will be wind, edema, itching and other symptoms, there will be small red bumps itching on the body. 2. Insect bite dermatitis: insect bite dermatitis is usually caused by mosquito bites and other skin inflammation, usually pimples, blisters and other symptoms, may also trigger the symptoms of itchy small red bumps on the body. 3. Eczema: the cause of the disease is unknown, may be related to genetic, immune, allergy and other factors, there will be erythema, pimples with itching and other symptoms, may also appear on the body itchy red bumps symptoms. It is recommended that patients with itchy red bumps consult a doctor in a timely manner, with the help of the doctor to clarify the cause of the disease and carry out reasonable treatment.