small painless sore on my labia?

Could anyone give me some ideas as to what this could be? I saw a gyno in mid March when I had a yeast infection (so bad that it caused sores) and a UTI.. at the time i was tested for STDs as well but everything came back negative so I want a second opinion.. It doesn't hurt, itch, or anything, it feels hard and just has a slight whitish top layer to it.

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you should go and get tested for herpes, might be just a ingrown hair…but doesn’t hurt to get tested.

i have one kind of like this if you want to look at my post it started out as what looked like an ingrown hair and i poked at it with tweezers (cause im dumb) so now its an open sore.. i have an appointment tuesday i hope we are both ok.. but i know that no matter what its not the end of the world. here for you.