It could be, and a good ob/gyn should be able to tell you what it is. Some women have a double uterus and double vagina, for example, or a septum that runs the length of the vagina and divides it into two.
There are some little holes in that area relating to the Bartholin's gland, and I think they can sometimes get cysts and then drain. You might ask your doctor at your next pelvic exam, and point out the place you are wondering about.