Painful bump on my outer Labia

For the past three days there has been this strange bump on my vagina that has gotten bigger and more painful each day. It feels like a a little hard ball when I try and squeeze it and it hurts a lot if I do try and pop it. It’s not an ingrown hair bc I’ve had those, this is very different. Also I’m a virgin so I know it has nothing to do with stds/stis, but I am getting concerned simply because it seems to be getting bigger and bigger, and as I mentioned, it hurt. I don’t know what it is or what to do.