Protruding bone behind the ear, most commonly seen in the mastoid process of the temporal bone, can be registered with the Department of Otorhinolaryngology, and the doctor will make a clear diagnosis after local palpation, questioning the clinical history and combining with relevant auxiliary examinations. If it is because the patient’s mastoid is obvious, which is normal and does not need active treatment, the doctor can diagnose it through palpation. If the doctor feels pain in the bone protrusion behind the ear after palpation, it is usually considered that there is inflammation, swelling of the lymph nodes behind the ear to form nodules or diseases such as mastoiditis. If initial confirmation is not possible, ultrasound of the back of the ear or CT of the middle ear mastoid is often used to aid in the diagnosis. It is recommended that patients with bone protrusion behind the ear should go to the hospital in time, and standardize the treatment after clarifying the cause of the disease, and the specific medication should be used under the guidance of the doctor.