What Is The Clear Odorless Liquid Dripping From Top Of The Shin?

I fell about a month ago and injured my knee and lower leg. It was very swollen and black &blur, red green purple. Xrays showed no fracture, but it took a couple weeks to get to the point I wasn't in pain. I started treating with ice for a few days and then heat for a few more days. It is now over a month later and yesterday I noticed a clear odorless liquid, like water, dripping from the top of my shin. I figure it's due to the injury, but can you tell me what it is?