A Rash On Both Sides Of Labia Majora Appeared A

A rash on both sides of labia majora appeared a few days during my period. There’s no burn occurring but a minor itch. I switch between tampons and pads during the day. Is it possible that my pads are causing the rash or is it something more serious. I’m also dealing with a head cold and taking antibiotics. Can that be a factor?