It’s not easy to see but I would go to an urgent care clinic TODAY, don’t wait to have it evaluated. Ask for a swab of the sore. It looks like a bit of a cluster, so getting it looked at ASAP is the best course of action.
Did you recently have oral or vaginal sex?
Here’s another picture it’s inside the vagina hole does not burn to pee https://imgur.com/a/H6DVkLG