I have a scar in my armpit from surgery, they removed a rib through my armpit, they do that for aesthetics reasons and to limit the recovery period done...
Also I have a round scar on my side from puncturing my lung, where the surgeons stabbed me to release the pressure build up in the rib cage that happens when you puncture a lung. Oddly enough, puncturing a lung was one of my greatest fears until I actually done it, its a bit uncomfortable but not too bad.
Although its annoying when the wife of the guy next door to you in hospital kicks your draining bag for your lung across the bay because she's a clumsy old cow.