Sharecropper feet?

Was interested in surveying the field here on this phenomena I've noticed as a flip flop wearing, sacrilegious and truly maniacal terrorist son of a gun (no pun intended) at the local range; it is a phenomena I can only characterize as "Sharecropper Feet," as though I have in fact been picking cotton all day, and you might as well call me Sambo at a point. I am a true masochist in that, if a shell casing falls between my toes or on my foot, with the 10mm piping hot after magdumping 4 mags within the span of 10 seconds, I let it ride and I just keep shooting, but I've noticed that I'm starting to develop keloids (not even joking about this one lmao, but i get those regardless, it's just exacerbated by the hot casings), anyone else have this feature?