You may get a USG (Ultrasound) Neck done to rule out salivary gland
enlargement such as parotitis due to mumps or duct blockage. the thick outer parotid fascia (covering of the parotid gland
) makes such swellings tight and extremely painful. USG Neck will also help differentiate between an enlarged lymph node
and the submandibular salivary gland. A detailed history and examination by your local doctor will help if his swelling increases or the pain does not subside with paracetamol
. Does he have any dental problem?