Hi - I just went through sorta the same thing. But it wasn't from a fill.
In July, I noticed a little bubble bump on my port incision. I called my surgeon and went in. He was at a loss and we decided to watch the area to see if there were any changes.
A month went by and it got worse. It actually felt like something was stabbing me. So, I went back and he lanced it open and sure enough there was a pus pocket or abcsess there. Again, we were both at a loss because I haven't had a fill in over 2 years. He sent me for a stat endoscopy - to rule out erosion. The area drained for 2 months and I was on antibiotics for 6 of those weeks. The area was not getting any better so I had to have emergency surgery on the 30th to remove my old port, move the tubing over and have a new port placed.
The new port hurts like heck but there is no infection anymore.
I hope this helps you a little.