it is strange...
But if that is in the out skin, i think it is not a problem...
I have a thomb vein and it is located at the shaft near the glande.
Try not to P.E for a few days... take ibuprofen 2 times per day, use hirudoid (it is a cream), until u gather other opinions... And if u are really scared (no reason for that) go talk to a urologist.