i am confused, did they use vinegar on the vaginal walls or your cervix (the very end of the vagina a.k.a. opening of the uterus) ? did they tell you they were looking at warts, or abnormal cells?
vinegar is an old method of diagnosing hpv... it turns warts and other abnormal cells white which lets the dr know these are different from your healthy skin cells.
i'm asking the first question because normally they only take biopsies of warts if they are discolored. but if they didn't even mention internal warts then it's probably exactly just what bflwc said.