A couple of weeks ago I noticed what looks like really deep scratch marks along the top of my shoulders. Upon closer inspection I realized this is under the skin rather than on top of it. I got to thinking what could be causing this and I realized in the last couple of weeks I have been doing shrugs on a calf machine because my grip wasn't keeping up. Is it possible this is causing these blood vessels to burst? Keep in mind when looking at it they are long and skinny, like someone scratched me from under the skin. It is pretty unsightly and I'd like some brainstorming as to 1) what is causing this and 2) how to fix it. The only reason I guessed calf machine shrugs is that it puts weight directly on the top of the shoulder like that, I've never done that excercise before, and I've never had this problem before. Any inputs / guesses are appreciated!