I think i got mine from girth exercises. I usually wear a cock ring so i can hold more blood. The only time i see it is when i do girth exercising. I dont even use the ring now and i still see it how exactly do u get one from stretching ??? It would seem to me that light jelging would aid in the healing of a thrombosed vein. I thought one would get a thrombosed vein from like over expanding the vein to quickly or over its limit for that matter. I need some clarification on this i think!