Drool rash in a toddler?

My toddler has had what I think is a drool rash around his mouth and for a little over a week now. I think it is a drool rash because he just got two new teeth a couple of days ago and has been drooling quite a bit. No fever, no other symptoms other than a runny nose. He had this problem when he was very young and the pedi had me use a little hydrocortisone which worked wonders in a couple of days. We didn't have any more issues in about a year, but now it is back. The hydrocortisone isn't working now, and I have also tried Aquaphor and vaseline several times a day for a few days in a row. I am doing my best to keep it clean and dry. I don't think it is yeast because the inside of his mouth is totally normal. It isn't showing any signs of improvement. I called the doctors office and the nurse just said it was just due to teething and unless there is fever or other issues there is nothing they can do. Does anyone have any suggestions?