Swollen lymph node under jaw, recently had root canal

Hi, I around two years ago I noticed an enlarged lymph node under my jaw. I knew I needed a root canal on one of my teeth directly on top of it. I had the root canal done, but the lymph node under my jaw is still just as large. It's almost the size of a marble, and I can move it. It's not fixed. It's under my jaw and I can grab it and move it just to the outside of my jaw. Sometimes I have pains in my jaw where I had the root canal but I guess those are just phantom pains or something. I find myself constantly worrying and messing with my lymph node and figured I should probably go see a doctor or go back to my dentist, I'm just wondering what to expect. I'm 22 in decent health and this is the only lymph node that is enlarged.

same with me, swollen lymph node (possibly tonsilar?) on my right side, ever since root canal. don't know why, took penicillin after the root canal, but now it's been two months and it's still swollen. think it might be the cigarettes. going to ask the doctor tomorrow.

**edited by moderator**