Well this is kinda embarrassing but when i masturbate i like a lot of friction so sometimes ill put my clit on the jacuzzi jet and the last time i did that i felt a sharp pain like a cut then i noticed these small cuts (i did not have them before that) and i noticed it was getting better then i used my wand (a lot of vibration ) a few days later (which kinda hurt but i was just too horny to avoid it.) The sore was only painful with friction , no blister , no scabs, no other symptoms .
If there was alot of pressure then it was probably the jet that did it lol
I currently have a place on my labia that looks like that. I was wearing a pad that irritated me and i scratched the area. I’m hoping that its just from where I scratched and not anything bad. I havent found anything else as similar to my mark than yours. Everything I search on google wants to point to STI, and that freaks me out. Of course its now the weekend and I cant call to get an appointment to be checked out.