Hi. Thanks for the query. As per your complain lumps under the jawline on the right side of your son can be swollen lymph nodes also known as LYMPHADENOPATHY and it is commonly due to infections in the nearby and distant regions of the body. You should consult a Pediatric dentist and get evaluated for: Any prevailing or recurring infections on facial structures like ear, throat, nose,teeth, salivary glands, teeth and gums etc or at times infections of distant body parts may cause secondary infection and swelling in distant lymph nodes. Inflamed gum flap over the wisdom tooth that has not yet erupted. After thorough examination and investigations the correct diagnosis and treatment can be done . In case of infections and inflammation antibiotics like Augmentin or Amoxicillin and anti-inflammatory medicines like Ibuprofen can be taken. In case if there is some doubt still left Biopsy of lymph nodes can be done. Hope this helps. Regards