Pain below the ear may be caused by inflammation of the lymph nodes, which is a bacterial infection, commonly caused by Staphylococcus aureus or Streptococcus haemolyticus. Lymph nodes infected with bacteria can manifest as redness, swelling, pain and even pus on the surface of the lymph nodes. It is necessary to take oral antibiotics for treatment, commonly used antibiotics such as cefixime, cefradine, levofloxacin hydrochloride, etc. Generally, after about a week of treatment, the lymph node inflammation can be controlled and the pain can be relieved. It is also possible that the pain is caused by mumps. Since the parotid gland is below the earlobe, a viral infection of the parotid gland when the resistance is reduced can cause pain and swelling of the parotid gland. Oral antiviral medication such as oseltamivir or intravenous ribavirin is needed for treatment, which usually takes about a week.