About a month ago, I noticed my shoulder blades began to hurt. It was only for a few days, and it wasn't that painful. They just felt sore, although I couldn't think of anything I had done differently. Anyway, just the other night, I noticed some strange marks on them. I don't know if they are veins, but it really just looks like someone took a red ballpoint pen, and made random short little marks on my shoulder blades. I know this is wierd, but I am stumped. The only thing I have figured out is that the marks were probably associated with the pain I was feeling earlier. Any ideas?