So I'm a sexually active 20 year old male and I've been having unprotected sexual with a girl who has no STD's she's been tested. Recently the side of my penis developed small pimples that look yellowish maybe the could be filled with pus. It itches and that area is frequently ashy, but it does not burn or sting. I'm scared I could have an STD like herpes but these don't look like blisters. HELP!!!