I think people that do not get injured often tend to have weakened immune systems to injuries. Not to be mean at all but look at his hands. My hands haven't been that clean since I was child. I've wrenched for 38 years and get cut several times a week, sometimes several times a day. My head is just a bunch of scars. I'm bald so I don't have any sensors and am always busting my head open hitting on the lift or bottom of a car. I typically don't wash the wounds, but I just wipe the blood off and keep working. The other guys in my shop are about the same. We don't get infections, or if we do we just let them run their course and eventually they heal. The only time medical attention is needed is when the bleeding won't stop and we need to get stitched up. I think the old saying "what doesn't kill you makes you stronger" really is true. These are just my opinions and not meant to encourage anyone not to seek medical attention if they feel the need. The old saying "better safe than sorry" is also true. Yes us old guys are full of sayings like that.;)
Edit: I forgot, I do let my dogs lick my injuries. Not sure if that counts as medical attention or not but it feels good :face-with-tears-of-joy: