I recommend treating seborrheic dermatitis with daily fish oil supplements. It dramatically reduces inflammation and redness caused by seborrheic dermatitis (approx 80-90%) within 4 weeks of daily doses; however, you start to see improvements in the 1-2 week range. It worked better for me than trying to pour vinegar around my eyes and mouth. Since inflammation and the redness is the hardest thing to fix, once you take care of that with the fish oil (and a diet high in vitamins a/k, ex. kale, spinach) you can then experiment with what works for you when it comes to any remaining dryness/flakes associated with this condition.