I've got a vain or something like that, between my shaft and my dickhead. I've got this since my birth and it doesn't hurt at all. However my current gf says she never seen this before at her past bf's. Anyone got a clue what this is exactly? Medical term would be nice too 
Picture:
http://www.imageno.com/thumbs/20080604/mc6y65evd9i6.jpg
Picture:
http://www.imageno.com/thumbs/20080604/mc6y65evd9i6.jpg