Small white lump inside vaginal lip

Hi, Please can you help me. I found a small white lump on the bottom left of my inner vagina lip, which to touch i can feel it move, it is however small, i have researched and have found nothing like it. it never bothers me until im on my period? its kind of like a cauliflower but only alot smaller.. im very scared and i have an appointment on the 31st but im worried i could have cancer or something serious? and i am scared of what the doctors may say. I have been with my partner for over a yr now and when we started the relationship i had un protected sex with him once or twice, however i went to the clinic and got tested for everything and it was negative. this is why im sure it cant be warts ect because my bf has no problem what so ever. But if he did have warts is it possible he cant see them or no there there in a year? and as far as i no he has never cheated on me. we are both quite worried about it.