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If this is a single lesion then herpes is extremely unlikely. It sounds much more like a sebaceous cyst or pseudofolliculitis due to an ingrown hair; pimples do not usually coming exactly on the same spot. I would suggest applying 2.5% Benzoyl Peroxide gel twice a day on the bump for 2-3 weeks to see if that helps; you can buy it over the counter. If the bump is because of Pseudofolliculitis it will help, not so if it is a Sebaceous Cyst. A Sebaceous Cyst would need to be surgically removed.
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