Me, three, had one of those. Ice, and a compression wrap, and don't stress it for a while. Mine was a very deep bruise in the quadricep. It actually went into spasm one day and I thought my hip was going to tear away from my thigh. I couldn't sleep on it at all.

Do you know how to do ice massage? It is the most effective way to ice these kind of injuries. You fill up paper cups with water and freeze them. Then tear the rim away from the cup so you have a little round ice block tohold onto. Gently massage the area with ice, no hdavy pressure. Normally the time is 20 minutes but for quads or other areas in deep muscle it's 30 minutes, 4 x a day. This should really help a lot. The compression wrap helps with the drainage. Do not stretch,massage or otherwise manipulate the muscle for a while.

If you are getting medical advice, be sure it's from a sports physician or someone who works with atheletes. I was told that heat was NOT a good idea... my trainer is the head trainer for our community college system and I usually listen to her advice.

this site here, while rather medical, is an excellent source of sports injury information:
The Physician and Sports Medicine

One thing I learned that's interesting, now don't 'get scared, is that with really deep contusions, ( I mean REALLY deep) if they aren't treated properly, the tissue can actually calcify as it heals, at a cellular level, which is permanent. This is a worst case scenario tho. You can read about it if you look up contusions at the site listed above.

Irulan