your body becomes desensitised and stops reacting to them, so you don't blister or scar as much.

Ooo I didn't know that. I have a corker of a scar acros the back of my hand from brushing it against teh oven shelf while removing a pizza (Wasn't even my bloody pizza either) but now I ocme to think of it I've done the same sort of thing since and not left as bad a mark as that one did.