question: I had tooth abcess and then a root canal. Dentist said it was bad abcess. Took antibiotic. Been about 1 - 1 1/2 years. In past 6 months had little puss pocket come up in area of root canal tooth. When took antibiotic no more puss. Started new job sitting ALL DAY. Behind and below my ankle now I have started having swelling and a little in front of ankle. It goes down by morning but never completely. It is the ankle on the same side of body of root canal tooth. Could the swelling in ankle be caused by slight infection left from root canal tooth? Am 58 years old. The swelling is not normal for me and it is rare to have it in the other ankle.