I was lifting today (pull exercises) and after one of my sets, I felt this strange soreness on the inside of my elbow. I looked down and saw a vein on the inside of my elbow sticking out a lot, and the area around it appeared very dark...like a deep blue/purple bruise. It came out of nowhere...it's not like I dropped a weight or something on my arm, it wasn't a bruise, it was something that happened while I was lifting. I ran my fingers over it and felt that it was sticking out quite a bit...like it was really swollen. I stopped lifting after that set just in case it was something to be concerned about...now (about six hours later) the bump has gone down a little bit and it's not quite as bruised looking as it was, but it's definetely noticeable and sore. Any idea what happened???