There are several reasons for small ears. First, it is mainly caused by inflammation of the external auditory canal, often caused by fungal or bacterial infection. Second, it may be caused by eczema of external auditory canal, which is mainly affected by allergic factors. Generally, the skin of the ear canal of patients will gradually proliferate and thicken, and some will discharge purulent secretions, which will cause the cheeks to turn yellow after solidification, resulting in the ear hole becoming smaller. Third, it is not excluded that Staphylococcus aureus infection will not only cause earache, but also folliculitis or inflammatory papules in the early stage. If not treated in time, the ear cavity will become smaller. If the above symptoms appear, you should take your child to the hospital in time and treat it under the guidance of a doctor. Never treat a child alone. Small ears are mostly related to heredity and can be changed by surgery. However, if it does not affect the body's operation, it is not recommended to change it through surgery, and it will be better to let nature take its course. Keep a happy mood in life and don't put too much pressure on yourself; Eat more nutritious food in the diet, and you can eat more fruits and vegetables.