The appearance of lymph nodes behind the ear is often caused by bacterial or viral infection of the surrounding tissues and organs. If the swollen lymph nodes are not obvious and the pain is mild, you can take oral cephalosporin antibiotics or antiviral drugs, together with drugs to clear heat and lower fire, such as Jin Yin Hua and Shuang Huang Lian Oral Liquid. At the same time, increase the intake of water and eat more fruits rich in vitamins, such as kiwi, apple, dragon fruit, etc. The lymph nodes can gradually subside. If the lymph nodes are obviously swollen, the pain is serious, and even the temperature is high, you need to go to the hospital in time to check. If a more serious infection is considered, it needs to be treated with infusion or even surgery to deal with the primary infection site. If the swollen lymph nodes are considered to be caused by other diseases, further blood tests, ultrasound, CT, etc. may be needed, and if necessary, lymph node biopsy should be performed to clarify the nature.