STDs do not cause pimples, or bumps on the skin that may look like pimples in the genital area.
Due to sweating too much in the genital area, and due to constant friction with cloth, sweating glands can become blocked. This leads to the formation of a bump filled with a liquid that looks like pus.
They disappear on their own in a few days.
They may reappear again, but, showering regularly, not wearing to thigh clothes, washing with an antibacterial soap, should decrease their relapse.


Best wishes!