Hi VinDiesel join the club! Some people think that the discolouring is a pigment issue, and the more I have been looking at mine the more I am thinking it could be. The only thing is that mine is quite localised as you would expect a bruise to be. So it could be a combination of both, initial bruising then leading to permanent/semi-perminant pigment change. I stopped Penis Enlargementing a while ago but have decided that if I cant beat it I will join in - I am gonna carry on regardless, I too dry jelq but some of the guys here have said they have noticed discolouration from wet jelqing so I dont think it really matters what you do.
Good luck