Well I can tell you about burns.
Ouch, Rip!
When I was 2 years old, I was playing near where Mom was ironing. Either she asked me to unplug it, or I did it on my own...but either way, I pulled an iron onto myself and managed to block it with my left hand. Quick visit to the ER and it was beyond them.
Make a really long story short, I have a skin graft from my thigh (scar tissue) for my entire left palm, and my middle finger. Over the years I've had to have plastic surgery to stretch, adjust and accomdate the graft as I got older. I can't stretch it as far as my right hand, so things like piano lessons were a bit odd since I couldn't quite hit the far away keys...but I adapted. My last surgery was when I was 22 or so...they did some zig-zag kind of incisions to allow my thumb some extended freedom, etc.
Luckily, it was never a hinderance for flying, or with the motorcycles...though I always had to adjust the hell out of the clutch cable to accommodate me.
And I'm lucky, sure its ugly, but I have the function...and its in my palm, where its not blatantly visible.