Hi mia - In "Optimal Wellness", Dr. Ralph Golan states that "This condition [SD] is thought to be caused by a yeast, Pityrosporum ovale. It may also be related to deficiencies of vitamins A and B, as well as lack of essential fatty acids. food allergies can also be a factor." He recommends:
Vitamin A, up to 50,000 IU daily
Vitamin B complex, up to 50mg. daily
Vitamin B-6, up to 100 mg. daily
PABA, up to 500mg. daily
Flaxseed oil, 1 to 2 tsp. daily
Borage oil, three capsules daily