Bump in vagina

So yesterday was the first time I've shaved down there in a few days. On top of that, I had sex with my boyfriend. Neither one of us have STIs or anything else like that. I woke up this morning to a sore bump that also itches on the right side of my inner vag lip. It hurts when I sit and when I use the bathroom. Is there any way the friction would've caused the bump? I get them sometimes but this one is the worst one I've had yet. Any advice on how to get rid of it would be amazing.