A super similar thing literally just happened to me!! Mine was a little easier to find (to the left of my clit), but I got a crazy bump that appeared literally overnight and was SO painful. A few days later, it popped – but it was still there just flattened, so I went to the doc and she said it was just a benign cyst in an unfortunate location. Gave me an antibiotic and directed me to put a hot compress on it 3x a day. Scary stuff and couldn’t find ANYTHING about it online.