I have rubbed off all my prints on hands and feet before. And cut myself on fingers and feet. Rob answered it best, but if you’re curious about how rubbing your fingerprints off works…
I swam for basically for five hours a day every day when we had a pool as a kid, around the pool we had a poured cement patio that had a pitted finish. It was pretty abrasive. Over that summer, I wore off my toe prints and fingerprints, they didn’t get calloused because they were always wet, they just got buffed away. And it hurt like hell. No, I mean a lot.
I stopped swimming and they came back, just the way they were before. :)
In the meantime, I messed around and made fingerprints with an ink pad I had. Cause it looked so weird.
Severe scarring will alter it, minor scarring may not. I have a scar on my left thumb that’s the width of a hair or so, it’s a nothing scar. The ridges are intact, everything is the same, it’s just white and pulls the skin differently if you watch really close. But my print is unchanged.
But on the bottom of my heel, I had a hooked piece of glass go in and come out, it was interesting. So now, I have a dot scar on the bottom. Itty bitty, but definitely changed some of the ridges.