One of my dogs drools a lot or remains very wet in that area but he is on cyclosporin for allergy control and it is a side effect of this drug (so I've been told).
I have trouble with my men getting infections in this area of their mouths/chins for different reasons but the way I know it is infected when it gets like that is the smell.
Is the area yellowish or green in colour ?
What is the flesh like under the hair is it normal or quite red and sore looking ?
If either of these things are present it could be an infection.
Harry (tri) and Digby (blen).