There is a bulge behind the ear, usually there are two etiologies: 1. Enlarged lymph nodes behind the ear, this is due to acute otitis media, acute tonsillitis, when the inflammation is heavy break through the lymphatic vessels, it will lead to lymphatic enlargement in the relevant area. Patients will find a small oval or round bulge behind the ear that is hard, painful, more obvious and immovable. In treatment, patients first need to check the local ultrasound can confirm the diagnosis, if the diagnosis of lymph node enlargement, the need for symptomatic anti-inflammatory treatment, you can enter ceftriaxone sodium, cefazolin sodium, cefotaxime sodium, about a week will be cured; 2, behind the ear chalk, this is due to the hair follicles behind the ear sebaceous glands after the blockage of the sebaceous glands, secretion can not be discharged out of the body and the formation of cysts. Examination can be found in the skin behind the ear an isolated bulge, soft, painless, surface visible fistula. For treatment, the patient needs to undergo surgery when there is no infection, the surgery does not require hospitalization, postoperative antibiotics should be applied to avoid local infection, and it can be healed in about a week.