I have been prescribed a z-pack (zithromycin) for sore throat infection, and my daugther is on Amoxicillin for ear infection and congestion. We both are on Nasonex. I find today her little rectum is raw. We use A&D ointment but it's still raw -never had this problem before. Could my antibiotics be causing this? She has pooped 3-4 times today when she is usually a every other day pooper...Any advice is appreciated.