try sitz baths and hot packs to get it to drain...if not go to gynecologist
I have something like that too. And im scared. Mine is squishy and tender. And it hurts really bad. I have to sleep laying on my back and i cant m ove or it hurts really bad. I think im going to go to the doctor. But im embaressed and scared to tell anyone.
It sounds like a Bartholin's duct cyst to me. They can vary from being quite small (but painful) to very large.
I had one the size of a marble approx 3 years ago, I treated it with hot bathes and when the pain was extreme I used a hot face washer (as hot as I could handle) and put it on the lump.
It relieved the pain for a short amount of time and slowly reduced the size of the lump.
I haven't had one since :D
If warm baths etc don't work, see your GP as it may need to be lanced.
Good luck :)