Hey, I know how you feel, that is what I have done for years, always trying to find new ways to get over it. I tried to send you a private message but in case I did it wrong, I'll write here as well.
the thing that works most for me is to just say "STOP" out loud as soon as I realize I"m doing it, stuck in the cycle. It is hard because sometimes you need to pull out hairs- or at least for me, like tweezing eyebrows- that type of thing makes sense. but from your leg, it does not make as much sense. It still feels right, it feels like its helping something in the moment, for me I get in a sort of trance sometimes..but I need to just say STOP to myself and remember that picking at my body is NOT going to help any actual issue- it is really just making it worse or at the best, helping me ignore what it is I am really thinking about or trying to avoid.
You could look into "skin picking" disorder..it's a subsection of OCD I'm pretty sure, and relates to that impulse to pick at your body compulsively. I know for me it happens after an emotionally intense episode- I'll suddenly want to just go at my body. It's not helpful, never is, never does a good thing at all- but you need to learn about your own relationship to it, what purpose it is serving for you, what feelings you are having while doing it that you can face on their own or while doing something else other than nit-picking at your body. The repetitive sensation of pulling out a hair is also addictive- it's like little pricks that numb out feelings in some way, at least for me..It has taken me years to get to where I am now, which is still not perfectly over it, but I do feel like I have much more control than I did. Hope that helps!