Small white bump on tongue?

So, I noticed a little pain on my tongue and took a peek at it in the mirror today. This is what I saw.
There's a little white bump on there. It hurts when it's rubbed. For some reason I thought it would be a good idea to use a tongue scraper. It felt like a very painful pinch. Any ideas on what this is? Is it serious? Or just like an "Oh I get these all the time it's just that" situation? Thanks!