I have to assume that it's juts a clogged pore and that sex makes it more visible. Popping it will make it last longer, so best not to. I suggest applying bacitracin or neosporin ointment once daily. Have a doctor check it out if it persists, and if it's no problem--I;m sure it will be no problem--just tell prospective partners that that's the case. They always go away of left alone.
Best.
Dr. Rockoff
Dr. Rockoff