Suggest Treatment For Sore Throat And Swollen Salivary Gland

Dr. I am worry for my son, when he was 9 months he had a ranula and and had incisions to cut it and drain the saliva, in 2006 his left side neck submandibular or triangle swallen and he had a CT scan and a needle aspiration, they sucked blood not saliva and the soft lump was benign, with the time it went away, now 2 weeks ago my son felt sick flu like symptoms and sore troat , stap came negative, and missed school 2 days, second week same both times the doctor said just rest and drink water, then 5 days ago the swallen started over the night increased a lot so big looked like a baby fist pushing out, this time hard and bigger, Otolaryngologyst thinks is a vascular malformation , but since my son had problems with salivary glads before and I noticed that he was spitting his saliva a lot I wonder if that has something to do, since little he always had rinithis or allergies but never treated