Same, I've got a few permanent ones on the pads of my palms under my little and ring fingers from using pick axes, sledgehammers and the like. The other ones soften but never fully go. Certain tasks leave markers from the specific pressures of the work, it's probably a good thing to rotate jobs so as not to wear any single body part too fast. I want good mileage from all my parts so might need to vary things up a bit.