Pain at the parotid gland below the earlobe when pressed is considered more likely to be parotitis. The parotid gland is the largest of the salivary glands and is located in both cheeks near the earlobe. The parotid gland is enlarged, centered on the earlobe, and can develop on one side or both sides at the same time. The causes are infectious, immunologic, obstructive and inflammatory enlargement of unknown origin. The most common cause of parotitis is infection, mostly bacterial and viral. Bacterial parotitis is mainly characterized by fever, localized redness, swelling, heat and pain in the parotid gland, and leukocytosis. The lesion enters the suppurative stage, squeezing the parotid gland can see the pus flowing out from the mouth of the duct. Mumps is a respiratory infectious disease caused by parotid virus infection, which is characterized by non-purulent swelling of the parotid gland and can invade various glandular tissues or the nervous system, as well as the liver, kidneys, heart, joints and other organs. It can often cause complications such as meningitis, orchitis, ovaritis, pancreatitis, etc., and lasting immunity can be acquired after the disease.