I have had a rash on my testicles and the lower underside of my penis for about a week. I started out on my left testicle as just a splotchy red rash but it spread to the bottom of my penis. I doesnt look like jock itch or like herpes, and i have been in a commited relationship for two years with the same partner and havnt had problems before. The rash doesnt look like bumps its just a patch of a red rash with random round red spots and is kind of moist and scaly around my penis. What could this be?