 [ Symptoms ] hi there is a hickey looking i would not say rash but it is about the size of a quarter and it is on the shaft of my penis im worried that it might be hiv because recently i had unprotected sex i am 16 [ Disease ] hi a lot of std is do take around 8 weeks to show them selves ok so young man as this is a visual thing you have a we cant see it its best you go off and show it to your doctor for a look see do not worry he or she has seen it all before and do not get embarrassed you showed it to a girl and now its a doctor good luck