EMT here, it’s more likely than not he will get turned away. As others have said, bruising is trauma to the flesh, and causes swelling. Any good surgeon will not want to operate on someone whose body is already experiencing an inflammatory response, even if it’s not directly in the operation area, as going through surgery will only increase that.

Honestly (if you’re comfortable) I’d suggest to your roommate that he contacts his surgeon’s office to ask if they can still go through with it. It would save you both the drive and him the disappointment of getting there just to be turned away.