I have pain at the back of my vagina opening, where the frenulum of labia minora is. This mainly happens during sex or while inserting tampons. i think it is an injury (?) sustained during intercourse due to dryness... It is sore and slightly swollen and it is becoming annnoying to deal with. I am not sure what this is and I want to know whether this could be anything serious, and whether it will go, or how to get it to stop. (I have been sexually active for just under a year and have quite regular sex. I don't know whether that is relevent...)