I took 50 milligrams of viagra today rent a hotel had sex for about an hour and a half, afterwards I noticed up around very beginning portion of my shaft is completely black, not worth the head is the complete opposite by my stomach, psych real black and when I push on you can almost see some red did I damage my self will it come back to normal, was it over working it was the blood vessels what did I do? it does not hurt though, and the woman I was with was clean