A.H.
T., I can't help with the rash but I can with the potty training. My son was almost 4 before he was potty trained. After you get the rash cleared up try this. I asked the pediatrician what to do because my son was going to pre-school and needed to be potty trained. I tried everything. Nothing worked. My pediatrician told me to put the cloth training pants on him with no rubber pants. After they go to the bath room tell them that they need to clean up after themselves. Make them take off their training pants and have them put them in the washer to be washed. It was messy, but it took exactly one day. After having to clean up after themselves, he decided that he didn't want that mess. I hope this helps. Good Luck.
A.