I have acne since puberty, but also some periods in time where my face was clean. But it's far less than in puberty now.
Too much shampooing is also bad for my scalp, it causes bumps etc.
I have no flakes on my beard.
Your situation does look like the photos here, right? http://oozingyellowcrusts.com/t/what-does-it-look-like-photos/20
I used oral itraconazol for some weeks to rule out tinea, but it didn't have any effect.
I still belief that demodex may play a role, but probably with another factor. Usually everybody has demodex, but animals such as dogs may transfer other types of demodex to humans, or maybe may increase the population. I don't have a dog, but I was taking care of a dog regulary. Although I cannot recall whether I got the problem about that time, but transfer from a dog is one of the things where I do wonder about.
@Jdowner You should give Soolantra a try, if you haven't already. It works for a lot of people here. (The main purpose of Soolantra is to kill demodex.)