I had a tooth extraction one week ago. The tooth had had a root canal about 8 years ago. The dentist had to cut the roots out because the tooth and its roots were fractured. The extraction went okay, though I had a lot of bleeding and had to go back to the dentist's office several hours later and she put in gel foam and sutured the area to stop the bleeding. Now 5 days after extraction, I have a almost pea-sized bump on the gum next to the adjoining tooth. It is not painful. I should also mention that previous to the extraction, I had been on Keflex because there was some infection around the tooth. Should I be concerned about this bump or "fistula?"