Small bump on my outer , labia?

I have this small bump on the outside of my basically on my labia, it doesn't hurt and its not itchy and no puss or anything comes out of it. Its been there for roughly 6 months and I am going to the doctors soon but I just wanna get everyones opinion on it firstly. Its small red and firm, not very big but its not soft. I do do ual things with my bf but have never had . What could this be please help!