Hello, I have a small blue bruise, smaller than a tic-tac, over a slightly visible blue vein that runs down the side (next to my arm) of my left breast. It doesn t hurt. It did when it formed. I was laying on my left side and felt a very sharp pain that lasted a few seconds. Now, however, its just there. If you have any ideas or suggestions on how it appeared, and what I should do about it, I would greatly appreciate it. Thank you