Please help!!! TMI.

Please help, idk what this is, I’ve never ever had anything like this EVER. I just noticed it was there because it hurt sort of like a pimple, I am sexually active, have been with the same person for 5 years and he’s the only person I’ve been sexually active with, it doesn’t burn down there, there’s no weird smell it just came out, out of no where??? Someone please help I’m extremely worried and scared. I shaved down there Saturday night and go bare