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This is Dr. David
after ejaculation or after urination?
a vein at the top of the shaft below the head of the penis swells after ejacualtion?
is the vein painful?
how old are you?
what medications are you taking?
this could be due to vasculitis of the vein in the penis or due to small blood clot in the vein.
an ultrasound of the penis can check the veins there for blood clots.
do you have a doctor you can see or a urologist who can examine the area
and order an ultrasound of the veins to check for inflammation or blood clots?