I keep hearing that he was treated at the scene, no hospital trip involved. Of course that's a real important detail so that's something that needs to be clarified. Medical records are not public so if he was taken I doubt we see anything made public as far as details go.SIAP
But didn't the cops take him to the hospital first? If that's true, then the hospital probably cleaned him up - at least, the ones I usually frequent don't let you leave all bloody and stuff.
As for bruises and broken noses - bruises almost never show up until more than a few hours later, unless they are severe (from my experience), and if a broken nose is ear to ear you would see it immediately; if it was like any of mine, they were more obvious hours after the fact.
Time to google if Zimmerman was taken to the Hospital.