Swelling of small children’s fingers may be related to mosquito bites, trauma, angioneurotic edema and so on. 1. Mosquito bites: If there are more mosquitoes in the summer, it may be caused by mosquito bites, mosquito bites usually leave venom in the skin, which may cause small children’s hand allergies, swelling. 2. trauma: small children may collide when playing, can cause finger contusion, swelling symptoms, may also be accompanied by symptoms of pain. 3. Angioneurotic edema: if the child is exposed to some allergic substances, it may also cause symptoms of finger swelling, which may also be accompanied by itching. Finger swelling in children may also be related to other causes, it is recommended to go to the hospital in time to identify the cause, under the guidance of the doctor.