Expert Q & A Answers About nabothian cyst symptoms

I can feel a small bump at the back of my girlfriend’s vagina when I finger her...what is it?

Lately when I finger my girlfriend, I feel a small bump on the back wall of the vagina where she likes to be touched. It feels like a pimple ⎼ it’s smooth to touch and it doesn’t hurt her. What is it? Is it because I don’t always wash my hands?