I took a couple good falls while snowboarding this past saturday. Each of the falls seemed to throw me onto the same part of my left buttocks. Afterwards, the left glute was very sore and a bit swollen. The pain has been seeming to spread into my hamstring and both that and the glute are still rather tight. Now, after having it pointed out to me yesterday, I have a very dark and large bruise which has formed around the area just above the back of my knee. Today, it is larger and hurts more. But not like a bruise hurts, more like a just sat in the car for 12 hours straight and stood up type of pain. I am wondering what to do to fix it?