Here are some differences between herpes and acne. Most pimples clear up pretty quickly after being popped; herpes lesions persist longer. Oral herpes more often appears in clusters of a few lesions close to one another, whereas pimples mostly are single. When oral herpes recurs, it generally reappears in more or less the same spot. Herpes often progresses to develop a golden crust, rather than a simple dry-blood scab.
None of this is absolute. To know for sure, see a health care provider, preferably when the lesions are less than 2-3 days old and before your pop or otherwise manipulate them.
Best wishes-- HHH, MD