Suggest Treatment For Itching In The Vagina

Hi, iam writing this for my wife.she is 32 yrs old healthy & she is having proper menstrual cycle. 3 months back she developed certain irritations in her vagina & we consultated a doctor.She prescribed some anti fungal/anti bacterial medicines & inspite of the treatment she did'nt get complete cure. I took her to a clinic & entire checkup including pap smear , pelvic scan etc was done & all the reports were normal.The irritation persists for her . Please advice on this .