I am a 24 year old male and i have
unprotected sex with my girlfriend. A
couple of days ago I noticed a red bubble
on the shaft of my penis and there is a
little pain. Just recently it popped and
some blood came out. now there is a small
looking crater where the bubble used to
be. It does not hurt anymore but, I'm just
wondering what it is.
if anybody could help me out it would be
much appreciated.