Yesterday I noticed I was rather itchy down there and when I checked I found a small hard lump in my labia near my clit it didn't hurt when I first touched it but when I pintched it thinking it was like a zit and I could pop it then it was painful. I cleaned myself and figured it would just eventually go away.

It's not gone away over night and while it hasn't seemed to have grown it is more sencitive and does now hurt to the touch, and worse because of where it is going to the toilet is rather painful with the lump stinging for ages afterward. What is it and how to I treat it?