Picking at scalp

So I have psoriasis or eczema or something on my scalp(my doctors couldn’t figure it out lmao) and it’s really scaly and addictive to pick at. It’s not itchy or painful or anything, I just know it’s there and therefore I need to get it off. But, most of my problem is that I keep reopening the wounds and starting the cycle over again.

Do you have any tips for me to stop picking so it would just heal?