Children with small bumps behind the ear that can be touched and moved may be due to lymphadenitis, lipoma, dermatoid cysts and other diseases, according to the condition of pediatrics, otorhinolaryngology, general surgery, dermatology and other departments. 1. Lymphadenitis: it is a common cause of active lumps behind children’s ears. Most of them are caused by inflammation of ears, mouth and throat, which causes lymphadenitis behind the ears, resulting in swelling. It is recommended to consult pediatrics or otorhinolaryngology in order to clarify the primary lesion, and with the elimination of inflammation in the primary lesion, the symptom of lymphadenitis will gradually decrease or disappear. 2. Lipoma: it is a kind of common benign soft tissue tumor, which may be related to heredity, abnormal fat metabolism and other factors. It is commonly found in the neck, shoulder, back and other parts of the body, and is usually a small painless mass with clear boundary, elasticity, and slight movement, so it can be consulted in general surgery. 3. Dermatoid cysts: a disease caused by developmental abnormalities, commonly found in the scalp, face, neck and other parts of the body, mainly manifested as painless subcutaneous nodules, slow-growing, patients generally have no obvious symptoms, and can be consulted in dermatology or general surgery. Children with small bumps behind the ear can be touched to move may also be due to other factors, it is recommended that patients seek medical attention in a timely manner, in order to clarify the cause of the symptomatic treatment.