This isn't exactly TMI but it's still kind of interesting/gross.
When I was 11 I had the shingles skin rash, thankfully it manifested itself on my rib cage & back. The infected areas were so sensitive to touch and so painful I would scream in agony with the slightest touch. For 2 weeks I didn't wear a shirt and laid face down on a bed...then I got sick of them, so I dig my finger under each rash, which were more of scabs at this time, and ripped them out of my skin. I now have 1inch long scars in various spots on my back and rib cage. I think doing so was pretty brutal, but I think back now to how much it hurt X_x.