There's a name for it!

I'm 19 and I've been picking at my skin for as long as I can remember. I have several main spots - when I was little, it started with my ears. Later, my upper arms - mainly my right one, more recently, my back and chest. If ever I've had a scab, I pick it off as soon as I become bored enough to do so. My picking has always been out of boredom, though. No other reason that I'm aware of, as I'm a relatively happy, healthy person. It doesn't just stop with me, though. I feel the insane urge to pick at pealing skin from a sunburn on other people - the same goes for my dogs. Because of this, I have to bathe my dogs frequently to prevent myself from harming them. I cause myself to bleed at least 3 times a day, probably more, but I'd never seen anything wrong with it - I really still don't - until other people started telling me to stop. But the problem is, I don't want to stop. It doesn't bother me and its soothing. I also wonder if this is a genetic disorder, as both my mother and grandmother pick to some extent, though not to the point of bleeding. It's interesting to have a name attached to what I do, though.