Last night I discovered a small, probably pea-sized knot on my right elbow. Upon touching it, I discovered I could move it around under my skin. I looked at it in the mirror, and there's an obvious little bump sticking out of my elbow. It's slightly blue in color, like the color of a blood vessel. Anyone either ever had one of these and/or know what it is/could be?

That I have never heard of or experienced. Is it tender? Can you post a pic, now I'm curious!

I have them all the time. Mind that I suffer from epocondilitis (lateral and medial) - mine are usually calcium deposits that gather around my surgery (injury) areas and disperse either by themselves or with a whack of a mallet (either by me or the doc. )

Is it hard or soft? Does it hurt when you move it? Is the area bruised?

I was thinking if it's the color of a vein, maybe it's a bulged out place in the vein or damage from having had your blood drawn there????

Well, it's on the outside of my elbow around the joint. I tried to take a picture of it but the lighting sucked and you can barely see what I'm talking about. It doesn't hurt or anything; it's just kinda there and it's weird.

I wasn't sure, so I just did a search and there are lymph nodes near the crease of the elbow.
Maybe something you might want to ask your doctor about.