My weird thing is I always carry fingernail clippers. I started doing it because I have a bad habit of picking at my cuticles, and it helps to keep my nails trimmed. I’ve learned that it’s a weirdly useful tool, though. It can cut things in a pinch, but no one sees it as something dangerous needing to be confiscated for example.
Not gonna say it cured me, but it helped me a lot to minimize the damage. As soon as that little bit of skin starts to bug me and I get the urge to pick I can just clip it off instead.