i'm not a cutter (while its actually quite hard to physically hurt me, have the pain tolerance of a bruise-covered baby) but i've noticed i have my own approximation - picking at any imperfections (especially things like tiny zits, ingrown hairs that are just starting, ect) until they're giant, bloody holes. its only a halfway-conscious action, and it only happens when i'm feeling absolutely shitty. and, strangely enough, it doesn't hurt, just a mild discomfort. in fact, its normally the mild discomfort that tips me off i'm doing it, but i can't bother to stop, or don't care enough, or whatever.
TLDR i have a big bloody hole on my arm right now that's completely self-imposed.
edit for fixing a tyop