What is this?

Does anyone know whats happening here? I shave my lady bits completely and shaved them like a week and a half ago. I wore tight lace thongs soon after because I'm an idiot. I remember when I was wearing it, it wasn't comfortable but I wasn't near home to change. Ever since then I have this scaley sore area on the panty line of my lady bit? Its so sore because of the area its on 😭!!

Its gotten a bit better in the last few days. I've alternated putting tea tree oil on it and Vaseline. Im not sure if its from chaffing or from ingrowns? A combo of both?? Its just so tender and wearing underwear keeps rubbing on that spot. I've tried wearing boy shorts for a bit of relief and it has semi helped. Please help 🙏

My husband and I are both faithful and I do not think its an std or anything of the sort. I just can't tell if its ingrowns, chaffing, pimples?! What do I do??