Don't worry I have the same problem too with my feet and skin. It's a impuslive OCD type obsession. You just need to let the thought sit there even if you want to pick at them or tear them. Try doing trials so you can test how long you can go without picking. If it is bothering you so much then cover up your fingers and resist the urge to take off the cover.

I have a skin picking disorder too alongside OCD so they mix together thought wise and mainly self inflicted multination for satisfaction and relief is OCD and impuslive. This is a tough obsession to fight because you won't stop. For me it gives me satisfaction but causes the doctor to check up with me because of it. You just have to see how long you can go. Stay strong and power thru it. It takes time and stress and feeling uncomfortable, but In the end it pays off.