Hey i think what you are having is what i come down with they are called bartholonian cysts... hope i spelled it right... I have benn getting them now off and on for 8 years some come and go on their own and some need to be surgically removed or drained. To cut down on the recurrences my old ob cut me open on the lips and left me open so my skin would cover and heal okay.... since no problems!! hope this helps
I think I know what you are talking about. I think I had a bump as what you have described. It turned out to be just an irritation and went away on its own. If you are really concerned you should make an appointment with your Dr. Otherwise keep it clean and try not to irritate anymore than you have to and hopefully it will go away.
Check out "Skene's gland infection" and see if that fits with what you see. Good luck.