What Causes Hard Movable Lump On Underside Of Labia Minora?

Hi i am 20 years old. I have had a hard movable lump under my labia majora size of a bean (on my bone area) for almost 4 days i notice it had gotten a little bigger. Theres no pain ( only when i try to squeeze it) , it has no color to it. Can anyone tell me what it can possibly be ?
Thanks.