Very small red bump on my gum?

As said above, I just discovered a very small red bump on my bottom gum in between my two teeth in the center. It hardly hurts when I touch it. Is this something I should be worried about or will it go away over time?
Update: I should also point out that I've never been to the dentist and I'm 19. My mom could never afford it. I also don't brush my teeth as often as I should.
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