A small bulge behind the baby’s ear is considered to be caused by lymphadenitis, folliculitis, sebaceous cysts and other diseases, which need to be selected according to the condition of the appropriate treatment, such as medication, surgical treatment, and general measures. 1. Lymphadenitis: a small bulge behind the baby’s ear is considered to be related to lymphadenitis, the child needs to take oral amoxicillin, erythromycin and other antibacterial drugs under the guidance of the doctor to promote recovery. 2. Folliculitis: Folliculitis may cause a small bulge behind the baby’s ear, and it is recommended that parents help their children apply antibiotics such as mupirocin under the guidance of the doctor. If the condition is serious, you need to follow the doctor’s instructions to take oral amoxicillin and other antibiotics, can help fight infection. 3. Sebaceous cysts: a small bulge behind the baby’s ear may also be due to sebaceous cysts, sebaceous cysts are generally based on surgical treatment, you can take the surgical removal of the cysts, there is a better efficacy. Parents keep the affected area clean and dry on a daily basis, and avoid letting the child scratch the affected area to prevent aggravating the symptoms. There are many reasons for a small bulge behind the baby’s ear, so parents are advised to take their children to the hospital for examination, to clarify the cause of the disease, and to cooperate with the doctor for standardized treatment.