There is a hard lump behind the ear and it is recommended to register with the ENT department. It is common to see a hard lump behind the ear and there are many reasons for this symptom. The size, scope and nature of the bumps can be initially determined through ultrasound examination, and then targeted treatment can be carried out. If the lymph nodes are simply enlarged, you may consider observing them, but you need to review the ultrasound regularly to compare the changes. If it is caused by fibroids, surgery can be considered to remove them. After surgery, pathological biopsy is needed to clarify the nature.