Coming to terms with this new found habitual condition.

I have subconciously known that I pick scabs for a while now. I can not pin point the exact time when it all started, however looking at everything now, I notice I pick more when I am under stress. I really don't know why I do it, my family have begun to notice this behavior and encourage me not to do it, but I can't resist it. I pick the spots on my fore-head and they then form scabs and the cycle goes on. When I pick I think I feel more comforted and relaxed. I had no idea that this abnormal behavior was a form of self-harm. But now understanding and realising what I am doing, I desperatly need to learn how to stop. No other teenager has mottled skin as mine. I am creating dense scar tissue on my face and leg and as much as I hate to say it, I need help. I don't know where to look first.