I am experiencing a pea size growth on the top right side of my upper mouth. It extends close to my nose.. It is tender but not that painful. A month ago I had a root-cannel that became re-infected and took medication for the infection. The infection cleared up and tooth feels fine..
Hi Dear, Welcome to Chat Doctor. Understanding your concern. As per your query small lump in the mouth is fistula formation because of tooth infection which is resulting in abscess and pus formation which is spreading to tissue spaces and causing facial space infection and pain. I would suggest you to consult oral surgeon for proper diagnosis and to rule out systemic causes like sinusitis and any infection related to middle ear. You should get RCT redone to Chat Doctor.  You should try to relax yourself. Take ibuprofen and acetaminophen for pain. Maintain oral hygiene by brushing and flossing. Gargle with Listerine mouth wash. Penicillin, metronidazole combination with an analgesic will be effective to subside infection if you are not allergic. Hope your concern has been resolved. Get Well Soon. Best Wishes,