Was it a muscle tear (ripping) or a tendon tear (twang) ?
I've become a bit of an expert on it recently as 3 weeks back or so I ripped my chest muscle. My bruising was quite extensive, covered the top half of my body on that side, down that arm, down the side of my stomach and lastly onto my knob and swingers!
If its definately a muscle tear the swelling wont go down for weeks. The doc and Physio I've seen both reckoned about 4-5 weeks! My bruising has faded massively now after 3 weeks. Just rest up and go get some professional advice!
Good luck with it and as said, take a week or so off the gym then get back into training your upper body.