Blood clot: If a lump is evident in or on a vein, a blood clot would be a possibility. It can fragment and travel through the vein upwards toward the lungs. Blood clot in a superficial vein tends not to travel or embolize. It would not move side to side. Since you're quite concerned, you should be examined by a physician to check for phlebitis.
Answered 6/7/2016
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