I have a cyst on my labia majora that only swells up a few days before i mensturate (this means that it swells up when i'm not mensturating at all and i'm not wearing any pads or tampons. the swelling pretty much tells that i'm about to start mensturating.) and stays swollen all through the mensturation until the 6th day (i mensturate for a week). At first I thought it was an ingrown hair since i do shave down there sometimes, but the swelling/un-swelling kept happening. Does anyone have a clue what this is? I'm a virgin btw.