[RNajarian]

The first thing I would like to see are X Rays. Ideally one before the problem, one during the problem and one now.

Abscesses can be called by a few things;

1) Periapical Abcess (Root Canal issue)
2) Cracked tooth
3) Periodontal Disease
4) Some type of pathology

Obviously an infection is not normal. Having not seen the swelling hard to say, I would like to see the x-rays.

I’ve seen infections/swellings based on a popcorn husk irritating the gingiva which resolved after it was removed.

If there was a periapical abcess initially I doubt it has resolved by itself