Hi! I have had irritation for just today, and when I went to the use the restroom, I felt more irritation so I felt and it felt almost like a big skin tag, but the size of a small marble! It's just shown up today, and I did have sex last night, (I'm gay, but haven't always been). Can someone tell me what it might be? I've never had any other sign of such a lump. It's directly underneath my vaginal opening.