Swelling in the neck under the ear but without pain is considered to be caused by lipoma, nasopharyngeal cancer neck lymph node metastasis, lymphoma and other diseases, different diseases, different treatments. 1. Lipoma: it is a common benign tumor, occurring in limbs, neck, abdomen and other parts of the body, with lesions of small size, clear boundary, elasticity and pushable, usually without pain and other discomforts. Because lipoma is benign tumor with slow growth, if there is no discomfort, it usually does not need treatment and regular review is enough. If the lipoma presses on the surrounding organs and causes discomfort or affects the aesthetics, it can be removed by surgery. 2. Nasopharyngeal cancer neck lymph node metastasis: in nasopharyngeal cancer, swelling of neck lymph nodes as the first symptom accounts for 60%, and the metastatic swollen lymph nodes are progressive, hard and inactive. It is hard and inactive. It has no pressure pain and starts unilaterally and then develops bilaterally. Nasopharyngeal cancer is sensitive to radiotherapy, and radiotherapy is the first choice, followed by chemotherapy or surgery. 3. Lymphoma: Clinical manifestation is painless lymph node enlargement, mostly seen in the neck, and may be accompanied by fever, emaciation and other symptoms. Patients can use drugs such as cedarbenamide and ibrutinib as prescribed by doctors, and need to combine with chemotherapy (e.g. vincristine+doxorubicin+prednisone+cyclophosphamide, etc.) to kill the cancer cells or inhibit the growth of cancer cells. The drugs must be applied under the supervision of a doctor. Patients with swelling under the ear and neck but without pain should go to the hospital in time for consultation and receive treatment as soon as possible after the cause of the disease is clarified.