Ultrasound has no therapeutic effect on lymphoma behind the ear, and ultrasound only plays an auxiliary role in suggesting the diagnosis of lymphoma behind the ear. Lymphoma cannot be detected by ultrasound, and the diagnosis of lymphoma must be made by finding cancer cells in lymph nodes or finding lymphoma cells to finally confirm the diagnosis of lymphoma. Lymphoma can only be diagnosed through complete pathological examination of lymph nodes and combined with immunohistochemistry, gene and chromosome examination. Ultrasound diagnosis is able to detect lymphatic enlargement, which may be caused by inflammation or tuberculosis, or metastatic cancer or lymphoma. Lymphoma behind the ear can be caused by a variety of reasons, and more accurate tests are needed to finally confirm whether you have lymphoma. If you feel unwell, you should go to regular hospitals for consultation in time, conduct necessary examinations under the professional guidance of doctors, and cooperate with the treatment according to the doctor’s instructions, so as to avoid delaying the diagnosis and treatment of your condition.