There is quite good agreement between a negative supplemental and a negative western blot, as a confirmatory test, but it isn’t perfect. The best test is the western blot but I think there is a very good chance that you are not infected.
Herpes does nothing to the texture of the skin of the penis, no.
If you decide that you want the western blot, I can help you with that or you can work with your own provider to get that done. It is done only at the University of Washington