A lump by the vaginal opening??

Ok so while I was shaving I discovered a small lump by the opening of my vagina and I felt around to see if it could’ve been a bite or something(don’t know why I would have one tho that’s all I could come up with) and it feels like a ball. When I googled the symptoms it said it could be a cyst in the vagina and the pictures showed it to be inside the vagina but mine is on the outside. Can anybody tell me what this is please?