Children’s hands have small bumps are caused by a variety of reasons, as follows: 1, long eczema, the child will have itching, eczema is a skin allergic diseases; 2, mosquito bites, baby skin is more tender, more mosquitoes in summer, mosquito bites will appear to have small bumps; 3, allergies caused by hives, hands can also have small bumps, more into a windbag-like changes. Pay attention to the child’s diet, if allergic to seafood, milk, eggs, certain vegetables and fruits, we should pay attention to avoid about six months and then observe; 4, hand, foot and mouth disease, hand, foot and mouth disease is an infectious disease, the first symptoms are the hands and feet first grow small bumps; 5, may be a viral infection caused by a variety of rashes, can also show small bumps on the hands, some children are not accompanied by fever and other symptoms.