What's this lump?

Has your girlfriend ever had a pelvic exam? If no, or if not lately, then she should visit her doctor and get checked out⁠ (out: Short for ‘out of the closet’. When someone’s LGBTQ+ identity is known to other people.) . That's the only way she'll figure out what that lump is. The best I could suggest is it may be her cervix⁠ (cervix: The opening to the uterus, the bottom of which is at the back end of the vagina.) . That's the lower tip of the uterus⁠ (uterus: An internal, muscular reproductive organ in the pelvis. During pregnancy, this is where a fetus will develop. The lining of a person’s uterus is also the thing that sheds every menstrual cycle in what we call a period.) , and it feels like a rounded bump at the end of the vagina⁠ (vagina: The internal passage leading from the opening of the vulva to the cervix of the uterus.) . Otherwise, it could be the G-spot, which is located on the ventral (belly-side) wall of the vagina, about 3 or 4cm in from the vaginal entrance. But there's just too many possibilities for what it is, so her best bet would be to just see a doctor.

In the meantime, you and your girlfriend can read the following articles:

• Your First Gynecologist Visit
• Innies and Outies: The Vagina, Clitoris, Uterus, and More