Children’s ears red and swollen may be mosquito bites, allergies, frostbite and other causes. 1. Mosquito bites: summer mosquitoes, insects more, a little inattention is easy to be bitten, the inflammatory reaction occurs, in the ear will lead to red and swollen ears. 2. Allergy: small children’s own immune system is not fully developed, for the outside world easy to allergic items, such as seafood, pollen and cotton wool, etc., resistance is insufficient, easy to allergic phenomenon, local redness and swelling of the signs. The performance of a large area of redness and swelling, presenting as a wind ball, with itching. 3. Frostbite: If the ear is red and swollen in the cold season, consider frostbite, it is important to keep warm and increase skin resistance. Children’s ears continue to be swollen and red when not relieved, should promptly seek medical attention, clear diagnosis and active treatment.