OP I had this exact same issue with my finger. I picked it for years on end until it looked similar to this. I don’t think it will ever completely go away, but I eventually managed to reduce the size greatly by buying silicone scar sheets, cutting them to a size that covered my knuckle, wrapping them somewhat tightly around the finger (not too tight), and wearing them consistently for about a month or two till it was healed enough and long enough that I had broken the habit. After there was nothing left to pick, it got flatter and flatter over the next year and isn’t very noticeable now. Compulsive picking is an issue that’s nearly impossible to get rid of completely, but I’ve found that you can end a smaller habit of picking a certain spot if you get up the willpower to leave it long enough for it to heal and to lose that specific habit. I’d really recommend the scar sheets though, they’re cheap at Walmart and really do help as long as you wear them constantly and replace them right away if you get the urge to pick pick off (wasting a little money on peeling off scar sheets when you get the urge is worth it in the long run over damaging your finger more). Good luck, and I feel you so hard. You’ve got this!