The only thing that matters is what the paramedics say. He could have had some blood and swelling at the scene but got cleaned up (which is STANDARD PROCEDURE) and given something to help the swelling.
You can keep your armchair medical examinations to yourself.
Cleaned up or not, it would still be visible with that very short haircut... wounds don't just go away. Swelling doesn't go away within an hour or so... not with the type of beating that he described. That's simple medical science... something that you've apparently chosen to ignore... which seems to be par for the course with you anyway, so I'm not surprised.