So...at the bottom of my vagina on the left side at the bottom of the flap it has become very swollen and sore over the past couple of days. Not too sure why as I have never had this before I have read this could be a vaginal ulcer or something which can be spread from STI, so I have an appointment with a clinic tomorrow but not too sure what else to do? Can anybody give me advice on what this could be or how it can be treated as it is sore and hurts when I sit down