I have one very close friend with depression problems who cuts herself up, sticks pins into herself, all sorts of things. I don't think she's worn a short-sleeved shirt in several years.

I have another, also with depression problems, who I recently found out cuts up her chest/torso area so that it doesn't show...

I could never bring myself to do something like that, and I think it's pathetic that people would do it just to look "cool".