What Causes A Very Deep Bruise On The Back Of My Calf?

I have a very deep bruise on the back of my calf. I went to the dr and they

performed all of the thrombus and blood clot tests (ct, sonogram, xray) and

everything was negative, which is good news. Two days ago I had a small scrape

in the middle of the bruise and it started leaking a clear fluid very slowly.

This is still persisting. Should this be something I should be worried about, or

is this the body's way of getting rid of the the edema from the bruise. Thanks