Thats nasty as hell! dude I am so sorry Dan.
Put aloe on that shit after it closes up and keep it elevated as much as you can. Move it as little as possible. Eat VITAMIN C LIKE CRAZY!!! Clean it clean it clean it... and it will heal quicker.
I attached 2 pics for you to see. Ask me how I did this lovely number to my foot last summer. Hey we have matching feet now. Wanna trade one good foot for one bad one? That way one of us can have two good feet again and the other, well, his life will pretty much suck, he'll will have two bad feet but some pretty wicked messed up stories to tell. I'll throw in a best kite to offset the deal...
Get YO ass back on the water soon brah!