Can a single pimple around the vaginal area consider to be an std?

No if its a pimple . A pimple is not an std. There are some infections that one might confuse with a pimple so getting an exam is your next step. Genital warts, herpes, syphilis and moluscum could be confused with a pimple.
Really a pimple? The question is whether it's really a pimple. I you are worried that you may have been exposed to an std, seek care from your gynecologist for a thorough examination, testing and a good conversation about your risk factors. Consider the choices you are making in your sexual expression. Always honor and respect yourself. You are worth it!