question: My 7 yr old son had a bad toothache, went to Dentist, dx with a cavity and was put on antibiotics. Several days after antibiotics, he was playing and jumping and he fell and his knee came up and  hit him on the same side as the bad tooth (upper) Now it has a pea size lump there. What to do?? Been there about 4-5 days now. He says does not hurt now.