What is large bruise on elbow from? I had a very tender, sore part right on my outer elbow. It's no longer sore or tender but now I have a huge bruise on the the entire elbow area - probably at least 5 in. In diameter. Any thoughts what that might be f

A . A bruise is a result of bleeding under the skin. It sounds as though you had a minor injury, possibly one that you we're even away of, that caused bleeding. Sometimes it doesn't take much to injure a small vessel. That would explain the tenderness and then the bruise. Most likely the bruise will resolve and you'll have no further problems. However, if your tenderness returns or the bruising continues, i would be sure to discuss it with your physician.