DAE skin pick? What causes this?

So I’ve been skin picking since I was about 8 years old. My father died at 7 and I think this could be tied to it. I have this one spot on my right hand which I’ve been picking for 8 years straight, I do it to my feet, fingernails, and sometimes my toes as well. I understand what excoriation disorder is and how it’s connected to OCD, but there’s literally 0 information online about what causes it. Does anyone else do this?