Should I go to the dentist for my swollen gum problem, or can a MD take care of it?

I ask only because insurance pays 90% of MD expenses, but only 50% of dental expenses.

My gum, right where my wisdom tooth used to be (pulled out several years ago) is really swollen and it hurts. It’s been like this since Saturday, 5 days now. I didn’t poke it or burn it or anything that I can think of. I have no idea what could be causing it, but it sure makes it difficult to eat.

Also, any thoughts as to what the problem could be?