Vaginal Itching before menstration

Patient: Is it normal to get itching on the vagina wall before my period? I had it last month and now my period is about a week away and its starting again. I used Canesten (Clotrimazol) 20 g crema al 1%, the last time up until my period started. Why is it back? I also have a Bartholin sist to the right, which doesn’t hurt, its just there. Feels like the size of a medium grape.