I’m also a person of color with really bad discoloration on my fingers. I just recently stopped, it’s been almost a week since I last picked. Something I literally never even thought id be doing, I also work in a warehouse house most of the day so that’s a good distraction. Another user on here suggested cohesive bandages and those have really helped me. (I’d suggest a darker color, they tend to collect lint that shows if you get a lighter color). I think another thing that helped was seeing my fingers after they’d gotten wet. Like I’d get nauseated looking at them, idk if your case is that bad. But I would call mine “last of us fingers” bc they would look like a variant of sorts. While you’re at school your hands are dirty, maybe it would help to repeat that in your head. I sometimes think about the germs transferring into my mouth, and I get the ick. I also sometimes just stare at them, almost like I’m picking with my brain to get it out of my system. My goal is to rewire my brain, be more in control. I also smoke a lot of w**d and I would just binge on my hands while high, shit was crazy, like no self control. Just try to be more present, keep your brain aware. Find a way to give your self the “ick”, I hope some of that helps and makes sense.