I have faint purple bruising on the front of my right shoulder. I have not experienced an injury and this bruising showed up a few months ago. It is very faint to the point that no one else has noticed, but I see it in the mirror and it has been a constant since it appeared. It does not seem to come and go and doesn't change colors. It is so faint that it is difficult to see an edge where it start and stops but it is there.