Huge burning bump on the top of my foot?

I have no idea what it is.. but on the top of my foot is this huge bump (about the size of two toes). It's kind of squishy and it's burning. It hurts and it's red. I just discovered it about 10 minutes ago, and I had socks on. I looks like a bug bite, but bigger and way more buring. I tried to look it up on google and webmd, but I can't find anything about it. Help?