Hello. My two year-old son has been having green, grainy watery diarrhea for three days. It is very acidic and he has a terrible rash that has led to some skin break down, no matter how qickly I change him. It is practically odorless, he has no fever,no vomiting, appetite is good, and hasnt eaten anything different or out of the ordinary lately. What's up with him and what do you suggest to treat and protect his bottom?