Hi, I am 17 and I have a sore and swollen inner left labia. It hurts with I walk and sit or wipe my bottom. Pain also extends up around the clitoris and down the back of the vaginal opening. I am not sexually active. This occurred towards the end of my period and after the use of an exercise bike. I also use sanitary pads instead of tampons. I am just confused as to what could have caused this? This is the first time it has happened.