My advice would be stop doing it immediately, give yourself time to heal properly (and not just one day), and if it persists see a doctor. Personally, I would be going to see a doctor anyway, persistent or not. A doctor can give you a real diagnoses rather than a bunch of meat heads (no offence guys) speculating over the internet. Then you can know for sure what is happening, and if you can even keep on with Penis Enlargement. Don't wanna go to the point of no return.
I'm no expert though, but that only seems like common sense.