Bulges behind the ears are seen in several conditions: sebaceous cysts, keloids, and enlarged lymph nodes. They are usually treated and will not heal on their own. 1. Sebaceous cysts: common in young people, due to the sebaceous gland secretion, if coupled with poor drainage will develop sebaceous cysts, usually no obvious symptoms, if the infection breaks out, there will be pain and pus, need to go to the hospital in time for anti-infection treatment, timely surgical resection. 2. Keloid: some people will have keloid after trauma due to their physical condition, the texture is usually hard, usually no symptoms, can be removed by surgery, usually will not be eliminated on their own. 3. Enlarged lymph nodes: Enlarged lymph nodes behind the ear are commonly seen in various inflammatory diseases, such as pharyngitis and pneumonia. Usually, it is necessary to treat the primary disease, and it will improve until disappear after the primary disease is cured. Head and neck malignant tumor lymph node metastasis, or lymphoma will cause lymph node swelling behind the ear, this case of lymph node is not easy to push, the border is blurred, the development of the speed of the faster, to consult a doctor in time. Bulging behind the ear can be seen in a variety of conditions, and should be actively consulted for a clear diagnosis and standardized treatment.