What is this strange localized swelling on my inside lower gumline?

Im not sure what this swelling is on my gum? It appeared a couple weeks ago. Hasn't gotten any bigger, hasn't shrunk. It causes no pain or discomfort. It fits perfectly under my partial denture which i have worn for 8 years. I've had poor teeth my entire life so ive been plagued with countless infections, cavities, root canals, fillings. It doesnt feel like an abcess. I don't have dental insurance so its not exactly easy to schedule countless dental appointments at this time of my life. Not sure what the puffy gum tissue could be? Hopefully its something that isn't serious.

No answers so far.

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