Thank you

Having had a very skin issue laiden lab/blue tick mix (he was my first love...) I learned VERY fast in how to detect it fast and treat it before it blew up with out having to run to the vet every time there ws a flair up. His biggest issue was seasonal hot spots on the sides of his neck/cheek that would fester from nothing to half his face over night.
Bullie breeds have a special place in my heart... who can't help but love a bully smooshy face?? I can't resist, but again HUGE skin issues. One thing you may see is a tell tale sign of excessive yeast presence is reddeing in the web between the toes, excessively red tear stains, red corners of the mouth and possibly the ear base. This is usually red yeast which is the most common form of yeast infection associated with allergic reaction. Dog has allergic reaction, body produces more yeast because of subsequent antibiotics stupid vets run to, antibiotics supress the immune system triggering yeast production into over drive, throwing off the body's natural PH and producing the deeper red staining.
Wow that's a mouthful

Now if there is not a lot of red staining but still the dog smells dreadful and has maybe a freckled (either red or black-ish brown. Almost looks like stipling) look to his skin... yeast patches. Usually can be found in arm pits, groin folds, face folds, anywhere that stays damp and moist.
In bullies personally (esp. the really wrinkled ones) I think you need a lower fat content diet because too many fats/lipids in the food means too many oils on the skin surface, and the oily skin provides the perfect starting point for all kinds of skin issues, yeast being just 1 of them (and the most common). I wouldn't feed an OEB a diet of more than 15% fat at the most.