Only way to be sure is to get tested.
It is possible to have Herpes if your mother had herpes, and had an outbreak while giving birth. Very unlikely though as most women choose to get a Csection to avoid this.
That being said, you probably just have a pimple. Outbreaks I've head have been like tiny blisters, and multiple ones in a single area, but never just one alone. And never have they poped like a pimple. You probably are just getting an ingrown hair after shaving causing a pimple.