It is friction, or something else in entirely?

Hi there. I have this other skin bump, does not itch or hurt. It happened shorty after I had sex with my partner last month. I didn't notice it as much but after a while, I did. I did some self diagnosis, and I use skin sensitive products from then. I do feel the need to consult but I'm currently having issues with my medical aid and time constraints but eventually I will. Please help/Advice before I could take the next step.

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