I am 23 years old, 5ft 4in and 115 pounds. I have no medical history other than having my son. I just noticed a very small sore on the inner labia of my vagina that resembles a canker sore. There are no other sores around it nor any drainage from it. I have been with the same person for five years and have always been tested annually. Do you have an opinion on what this could be? I am freaking out.