On my left arm (an a little on my right), I have a blood-like rash. It's clumped up somewhat in the same area with the color of blood. It's below my skin. I'm not sure what it is or if it needs medical assistance, but all insight is appreciated.
In total, it's about 3 inches long and one inch wide. It's been about the same size the whole time. The first year I got it, I thought it was maybe related to stress, but then it started coming in every year.
Just a wild thought. Is there any chance you are causing this by, maybe how you are carrying your books or something that might be stressing the skin? It's so odd that it goes away when you're out of school.