Children suddenly itchy red bumps on the body, considering acute urticaria, insect bite dermatitis. 1. Acute urticaria: most of the occurrence of acute urticaria and food, drug allergies, but also may be endogenous infections, such as upper respiratory tract viral infections, etc., the patient’s main manifestations for the appearance of skin lesions of the skin like a wind ball, the wind ball is bright red or pale white, surrounded by a red halo, accompanied by obvious itching. 2. Insect bite dermatitis: this situation is more common in summer and fall, summer and fall when more mosquitoes, if the mosquito bite will have poisonous sap into the body, allergies will occur, insect bite dermatitis, but also pimples, pimples and petechiae, and so on. Sudden red bumps on the child’s body may also be other reasons, it is recommended to go to the hospital in a timely manner, by the doctor to clarify the cause of the standardized treatment.