I have various ones. Never really thought to measure them. Because my job includes working with sharp metal, brazing/welding/soldering, and doing mechanical work, most of them are localized on my hands and forearms. I have one I'm particularly fond of on my left wrist where a blob of solder burned through until it got down to that nice white fatty looking stuff. It's about the size of a quarter. One on my left bicep almost matches it, but slightly smaller. A lot on my knuckles, hands, and so forth. One Harry Potter-esque one on my forehead from when I was a kid, that I don't remember getting. I guess I fell down the brick stairs at my grandmother's house and skinned off a good chunk of my forehead. One about 3" long on my head I got at work while doing an AC job in an attic (sheet metal cut). One on my left index finger where a razor knife cut through and halfway through my fingernail, all the way to the cuticle. One that runs the whole length of my left eyebrow where my mother accidentally hit me in the face with a baseball when I was a kid (it hit my glasses and those split my eyebrow open). So yeah, I guess I've gotten a few.
I still think Brad2dBone probably has me beat, though.