Rash above lip

Hello, I was writing to put my thought in. I have a 4 yr old fd that probably gets the same rash you are talking about and it comes from her sucking on your lip(s). It is more the top than the bottom but it has been both at some times. At night before she goes to bed I take a small amount of diaper rash medicine and I apply it to her lip(s), by the morning it looks alot better and will eventually clear when she stops. I hope this helps.