I am sexually active with my boyfriend of 2 years now, we both have been checked for diseases before starting to have intercourse and we are both disease-free. Three days ago I woke up in the middle of the night to pee and when I wiped it felt sore; it did not hurt when I peed. The next morning I looked down there with a mirror and saw something that looked like a blister. It was dark greyish colored. Gyno took a culture of the blister which is now white-colored. I do have a canker sore in my mouth, which showed up around same day I got this blister , but I think I got the canker sore from biting the inside of my mouth, like usual. what the heck else could this blister be if not herpes? Could my canker sore in my mouth have spread to my vagina somehow?