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Im not sure how to answer, but I can give you my experience.... I OCD about certain things. Not everything. And I have noticed that I do tend to pick at my scalp, around my nails, and my lips. So much so that I bleed. I have tried a number of things to keep from doing it. I have found nothing. =( But I do try to stop myself if I notice I am doing it.
I'm suffering with this at the moment, it is making me want to harm myself, regular maybe every other thought being he one I don't want to think about and as for picking, well it must go along side with it because I'm constantly feeling my face for a imperfection. My mum will tell me off etc but I guess that's who we are