Pink around the eyes and jaws

Do you people with white faced bullys notice that the pink skin around the nose eyes and jaws gets pinker with hard play. Maxi came in lastnight after hardcore chasing and being chased with 2 other dogs and her skin around her eyes and mouth were REALLY pink. Almost like an allergic reaction. It didn't seem to bother her, and she looks fine today. Is it normal for dogs to get red faced like people do after alot of exertion?