Doc,
Last week I was working on a roof and stepped on a rotten board. It broke and I fell through the roof. I hit my left shin on a 2x4 board as I was falling. Immediately, my shin swole up. It looked like half a tennis ball under my skin. It also broke the skin and has since scabbed over. About 6 hours after the injury, the swelling went down and seemed back to normal. There was really no pain. Well, two days later, the swelling came back again. It looks like a huge blister about 4 inches in diameter. There is no pain and I run 3 or 4 times a week. It just looks like there is a huge fluid build up in it. What do you think the problem may be?