bump on vagina?

I have a bump on my vagina (the area above the lips) and it's really sensitive when I touch it (I've only touched it like 3 times seeing what it is) 
It's about the same color of the rest of my skin except a little pinker
I can't tell if it's just a pimple that's forming or if it's something serious
I'm planning on having sex later this week and i wanna get rid of this bump