Hi I Have Some Swelling Below My Elbow On The

Hi I have some swelling below my elbow on the inner side of my forearm. It's a little red and feels like a bump. I don't remember beer bumping it, but I did work out with weights as I do every other day. I was trying to get done quickly today. Do you think I hurt my muscle or could it have something to do with my heart since it is on the left side?