Are there any STI's that cause severe external itching/irritation of the inner labia but no visible signs of infection? I have been treating it as an external yeast infection but am finding no relief so is there anything else it could be? Now I have the itching along with a burning sensation but I'm guessing that is from scratching. It feels like it's getting worse because it started on the inner part of just one labia and is now affecting both sides as well as the area surrounding my vaginal opening. I have had unprotected sex with a couple people recently so I'm worried. I have also been experiencing pain during sex recently and was wondering if it could be related?