Hi,
My bullmastiff girl had this at about 9 mths too, took her to my vet and he diagnosed puppy acne - he advised it would clear itself and didn't need any medication (unless infected) although they were quite angry. I just kept her muzzle clean, popped a little propolis gel on and they did clear. As a side note, my first girl, never had this - so it is not a common to all bully problem, or really anything to be too worried about. Just keep an eye on it and keep clean ...
Answered by Anonymous - 10/8/2012 6:57:14 AM