I have been picking my scalp since I was in high school (a long time) and never even thought about it. But I was always ashamed. I've gone for a few weeks at a time without picking, but it always starts again. I am going through a bad period right now-there are maybe five spots on my scalp that I have going. The funny thing is, I am right handed but i always pick with my left. It is the only thing I can do really well with my left hand! Weird.