That may cause the discoloration... could easily be the reason for it.
i havent injured my penis at all. i jack off a lot, does that have anything to do with it?
Yes, especially if you have injured the area in any way.
but i wasnt born with it. can a discoloration randomly just come up?
It sounds like it is just a discoloration. If you are really concerned about it, make a doctor's appointment.