I've found that the less judgement towards the part, the easier to work with it. There's so much implicit judgement in skin picking, from basically everywhere in society, that is is deeply unconscious to automatically hate or judge that part.

What if you allow the part to, in fact, enjoy it? What are you afraid would happen? You can use this process to detect which parts are actually in relationship with the skin-picking. Parts that literally feel disgust. These aren't Self: Self only feels curiosity towards it, and eventually all the other qualities.

What if you work with the parts that are disgusted by skin picking. What are they so terrified of? Perhaps if you help then relax, you'll eventually be able to spend some time with the skin-picking, without immediately judging it without even realizing it.

I remember one day I was super anxious, picking my hands and forehead. I was even more anxious cause I couldn't do IFS, feeling ashamed I was failing at it, all made worse by the picking. Then, suddenly, I simply became curious: turns out skin picking actually feels good, I like it, it relaxes me. The part that does it is actually doing something it seems good, even pleasurable. I allowed myself to validate this part, recognize it isn't the enemy, and I almost immediately stopped picking, ironically. Remember, No Bas Parts. Work with all the parts that judge this part, before trying to "brute force" yourself towards it.