question: Female 5 5 240 lbs 39 feel ok smoker.....red spot with perfect white circle sore at the momement went to dentist 6 days ago for what I thought was needing a root canal because of pain when drinking coffee ....nothing found but was put on amoxicillin 500mg 3x a day ? What could it be? Do I wait to see if antibiotic takes care of it?