I am 23 years old and I noticed this lump on the right side of my vaginal opening earlier this week, I am about to start my period in a few days and I am on birth control. I am waiting for a call back from my doctor, but I was looking to see if anyone can help me identify this beforehand for some ease of anxiety. For reference it is painful if a lot of pressured is applied or during sex. I did feel some discomfort while sitting in a certain position yesterday. Any help is appreciated.