Itchy vagina hole

Okay so my vagina is itchy but only right around the hole. How do I fix it? I think it was maybe a particular thong I wore that irritated me but now it just it’s so bad. I woke up in the middle of the night cause it was so itchy. Do I just wait it out? It’s not an std, I’m with a long term partner, I’m pretty sure it was a thong. What do I do?