If it's on the inside it's probably an infected Skene's gland. You can look up treatment options in the net. You might try soaking in a hot tub first. That can sometimes get them to drain. Good luck.
I have the same thing. Mine is sore to touch, can become very itchy and not much to look at - its under the skin. I've had it for about 7 days now and feel to embarrassed to go the doctors. Is yours the same?