When you find a lump behind your ear, you can go to an ENT, dermatologist or dentist depending on the characteristics of the lump. 1. If the bump is superficial, i.e. easy to move when touched, it may be an earlobe chalk tumor caused by folliculitis around the earlobe, and then choose to go to the ENT department. 2. If the location of the bump is behind the ear muscle and it is red and hot, it may be the inflammation of the lymphatic vessels around the ear, then you can choose to go to the ENT department, the doctor may also check the nose, throat, voice, etc. to see if there are other infections, which may lead to the inflammation of the lymphatic vessels around the ear. If the bumps are small, they can be controlled with topical anti-inflammatory medication, such as clindamycin ointment; if the swelling is too large, surgery may also be considered. 3. If the skin on the surface of the lump is normal in color and hard in texture, and there may be a small hole in the center, it may be an epidermal cyst, and you may choose to go to a dermatologist. 4. If the skin at the location of the bump has been previously injured in an accident, it may be a keloid formed during the recovery period, and a visit to the dermatologist is an option. 5. If the lumps are deeper and when touched are not under the skin but deeper, even below the bone, they may be lumps or swellings of parotid origin. In this case, you should choose a dentist to see. The specific treatment plan needs to be dealt with separately after a detailed examination. Please go to a regular hospital for treatment. The above is for reference only.