Children’s swollen ears are usually caused by trauma, otitis externa, frostbite and other reasons. 1. Trauma: it may be due to the children’s ears unintentionally suffered contusions, bumps and so on. This leads to soft tissue damage in the ear area, causing children’s ears to swell. Cold compresses can be applied to the ears for a short period of time to relieve the swelling. 2. Otitis externa: the skin resistance of the external ear canal decreases, inflammatory factor damage damages the blood vessels and lymphatic lymph caused by local exudation, which can cause children’s ears to be swollen. 3. Frostbite: may be due to a long period of time in a low temperature environment, resulting in ear frostbite caused by local blood circulation disorders, can also lead to children’s ears swollen, usually should also pay attention to children’s ears to keep warm. Children’s ears should be swollen in time to seek medical attention, clear diagnosis and active treatment.