Big squishy bump on my leg?!

About a few weeks ago, when wrestling season was going on, I would constantly be kicked on my left shin at practice. I had a bruise near my calf muscle, but its was on my shin. The bruise is gone, but now I have a big bump on my shin. I push it and it feels squishy and it moves around under my skin. Is there fluid in it? I'm going to the doctor this saturday for a vaccination and I will show her the bump. But I just want to know what it is.