What Causes Pimple Like Sores On Pubic Area?

i got these pimple like sores on my MONS pubis part, I am scared, AND i haven't even slept with anyone who HAD herpes! i also got checked by A gyno And they said i was Clear of any std's! could it be from stress? or not keeping myself clean right? OR shaving? their not painful, I never had fever like symptoms, their just itchy