I have had Seborrheic Dermatitis on my face for the past 4-5 years. Tried a few treatments with cream (cortisone I think it was) but they never worked and I lived with it, especially as the flare-ups seemed to come and go.
However, I took the Antibiotic AZITHROMYCIN for a respiratory tract infection and it seemed to have cured the the Seborrheic Dermatitis (it is no longer visible on my face) at least temporarily.
The dosage I took was for skin and skin structure infections as well (according to the box).