[Van]

I'm not a Doctor, but I played one once in Who's Life is it Anyway, Even if you can't get coverage through workmans comp, you need to go get that looked at. A large bruise like that with subsequent development of lumps or hard spots could indicate the developement of some small blood clots in minor blood vessels of the legs, not necessarily a huge problem, but if one breks loose it could create an embolism which would be bad. For that matter they could just be something Sebacious cysts caused by trauma to the area.
I've done a similar thing before, though. Sliding out of the genie and my foot slipped. I however, scrap the heck out of my lower back and had this really nasty stright line cross the top of my butt. Ouch.