My 14 Month Old Has An Ear Infection That Went

My 14 month old has an ear infection that went into her eye. She has been on Augmentin for a few days now and she has a huge blister boil in her mouth on the bottom right side of her mouth. It is fluid filled and the size of a jelly bean. Is this a reaction to the medacine? I have 2 other children and I have never seen this before.