When I was a child, I would have intense itching due to an unknown skin disease, and whenever I scratched it my whole body would swell up as if the scratched areas had raised lettering.
I have a painful memory from those days of my mother using a folk remedy of sprinkling salt on a briquette fire, putting a broomstick momentarily on top of the briquettes popping with salt, then sweeping the broom over my back and buttocks.