Lately, I've had so many dental problems. Today I felt a pain, more like discomfort, on my gums. It was a bit far back on the left side of top of my gums, so I took a flash light to it...

It's a huge bubble that has a light red color inside. It almost looks like blood and pus. I read up on blood blisters but I haven't pinched my gums on anything.

I'm really worried. What do I do about this?