do keep the area clean and dry by using absorbent bibs frequently, gently wiping away saliva with a soft cloth, and applying a barrier cream to protect the skin... if still persists, do seek professional healthcare
Could be drool rash. Can apply mustela cicastela moisture recovery cream.
best to bring her to see a pd or gp. don't self-medicate
Drool rash. Even now at 16’ on and off have