What is this please..Fearing the worst.

I have noticed this smallish pimple on my scrotum this morning. It doesn't itch or anything just really tiny almost unnoticeable unless I go looking for it. Did a urine test last week which came back negative for Gonorrhea and Chlamydia yesterday but this bothers me. I wore an admittedly tight brief last week which may be the reason for this but...what if I'm reaching here. should I be worried?

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