He might be developing an allergy to something. This is how we first noticed Jake was having problems with his food. What is he eating? Are his ok? Soft vs firm? Any itching?
Not only what are you feeding him but what kind of bowls is he eating and drinking out of? Many bullys get a reaction to plastic bowls. Stainless steel are the best.
Also, try hard to wipe his face dry after he drinks water and eats his food. The build up of moisture in his wrinkles could lead to skin infections and yeast so keeping him dry is important.
Franklin gets a red face sometimes when he wakes up or when he's playing but since I changed his food to Fromm beef frittata it's been a lot less red an plastic bowls give him little chin pimples but I wouldn't be to concerned it doesn't look bad you just can really see it cause of his white face
All great advice above, nothing to really add. My Blossom is also white, and has allergies to chicken, salmon, corn and grains, si we switched from Royal Canin to Fromms Beef. She used to get pink face, pink ears, and chin, and also chin acne or rashes, after the switch this cleared up.