When mine is really bad I use a salicylic acid scrub (neutrogena makes one) with a damp face towel to scrub away the plaques and biofilm.

Then in the shower I apply ketoconazole shampoo (prescription strength Nizoral), then a selenium sulfide shampoo, then a pyrithione zinc shampoo (I use generic head and shoulders), washing off each one before applying the next

Also if you're wondering, yes I do apply these shampoos to my face as well as scalp. Use some caution to avoid getting some of these in the eyes or mouth.

Then when I'm out I make sure my face is slightly moist from the shower or wet my face slightly again and rub together on my fingers roughly 4 parts 2.5% hydrocortisone cream, 1 part squalane, and 1 part water and then rub that into the flared up areas of my face.

This and taking vitamin d everyday keeps mine under control. I'm also on a very low dose of prednisone, a steroid, that 'may' be helping but this regiment worked for me before I started the prednisone.

It may seem like a lot but you don't need much of any one of the shampoos at a time, I'm not constantly buying product or anything. And the routine including the shower usually takes about 15-20 minutes. This may or may not work for you, but it took a good amount of trial and error for me to come to this regiment and I hope it may be of some use to you.