I agree, get help. I ruined my arms and legs and now must wear long sleeves and long pants to work every day so that the students and staff don't find out about it. Sometimes it's really super hot it my classroom but I still can't take my sweater off. It's embarrassing when people mention it.

It's a really hard habit to break. I had a point in high school where I just did it every day, even when I didn't want to. I couldn't kick it. And now it's my first reaction to everything that goes wrong. Thankfully I don't do it very often anymore. But even now at 28 I still struggle.

Don't let it become a habit. It's no good.