Sorry for the delayed post!
I hope you gonna read it!
The bump you have is probably a sebaceous cyst, extremely common growth and probably most of us will have a few over the course of our lives but they resolve spontaneously.
Usually, it is a firm, round, mobile, flesh-colored bump that is painless.
Sebaceous cysts of the genitals are less common, but, can be seen in perineum, the area between vulva and anus.
Has it changed in a meantime?