The exact cause of your facial hair dandruff can be a combi-nation of stress, yeast that lives in the skin, and colder weather.
One of the more common reason for the flaking of the skin is the yeast hides from ultraviolet light in the protection of facial hair.
Without your facial hair, the ult-raviolet light slows the growth of the yeast. The beard hair protects the yeast, and it thrives in that darker location.
So as you continue to grow your beard, the condition can get worse if not treated properly.
While shaving will elominate this condition in most men, you want to grow your beard and still have a dandruff-free beard as well.