About a month ago I had an apicoectomy on my top back molar. I had felt a bump in my gum ever since. When I went back to the oral surgeon a week after the surgery, he said I had scar tissue and that could be the bump. Last week, I actually looked at the bump up under my gum, and realized it is at the top of my gum in a 1/2 moon shape with two white spots at either end. I am assuming that is a fistula. My questions are 1. Could it be scar tissue? 2. Where do I go from here if my apico failed. I really don't want to pull the tooth. Has this ever happened to anyone? Thanks for your help.