Hi, I Have Just Been Weight Training And Have Stopped

hi, i have just been weight training and have stopped 30 mins into the set as i have a bulging vein in my elbow crease about an inch long and a 1/4 inch wide. it was painful when i noticed it, but now my heart rate has come back down this has gone. when i raise my arm above my head it goes and my skin looks dark and dimples in where the vein is. it has been around 10 mins since i noticed it and it is still there. is this something i need to get checked out or have i just been pushing myself too hard?