Yes, I agree that the flaky skin could well be favus, a fungal infection. Miconazole and clotrimazole are 2 common creams that are used. Daktarin looks to be a brand of miconazole. The ear treatment of using hydrogen peroxide and QTips, and applying cream/ointment would be good.
Good advice from Aygous on DE, mites, and the possibility of face mites. Permethrin is very good for body mites and treating the coop, roosts, and nest boxes.
Can you get a more clear picture of him? I am looking at his face to see if it is pale or has a chaulky dry skin. Is he or the other chickens molting? His swollen shut eyes sound like a respiratory disease such as mycoplasma or coryza. Have you seen bubbles/foam or pus in his eyes. How does he...