Small bumps all over the body may be caused by prickly heat, scabies, hives and so on. 1. Prickly heat: also known as corn rash, mostly appears in summer or hot weather. Its main manifestation is the appearance of pinpoint-sized pimples or mounds of herpes, or small bumps, which can be accompanied by itching, burning and other symptoms. It can lead to small bumps all over the body. 2. Scabies: is a kind of skin infectious disease caused by scabies mite parasites in the skin, can invade the whole body skin, often occur in the thin and tender skin. Its main manifestations are pinhead-sized skin papules, papules, grayish-white or light-black fine line streaks, often accompanied by intense itching at night and other symptoms. It can also lead to small bumps all over the body. 3. Urticaria: a kind of limited edema due to the dilatation of small blood vessels of the skin and mucous membranes and the increase of permeability. The main manifestation of the size of the red masses, erythema, accompanied by skin itching, severe cases can also appear nausea, panic, shock and other symptoms. It can also cause small bumps all over the body. There are many other causes of bumps all over the body, which should be emphasized, timely consultation, identify the cause of the disease, and follow the doctor’s instructions for further treatment or therapy.