had unprotected sex with someone i trust few days later this pops up doesnt hurt or burn at all seems to be shrinking after a couple days [pics](https://imgur.com/a/nJw3oXZ)
August, the sex was most likely coincidental - the usual cause of these is that a skin pore becomes blocked ans a puss creates the bump. The best way to treat this is with Liquid Antiseptic (not creams or ointment versions) and dab a little directly onto the bump 4 or 5 times a day, once it begins to subside, 2 or 3 times a day, then 1 or 2 times daily until it has completely healed.