there is this guy who i think has a similar problem with you.. there is a forum here for Seborrheic Dermatitis .. there are very few posts there.. you could easily locate his message.. he took a lot of ascorbic acid (vitamin c).. you may want to try it.. i also have Seborrheic Dermatitis and has some scaling all over my body.. but i don't think it's as bad as yours.. i usually have red rashes on my face.. i am on p b and c shakes plus yeast cleanse capsules by solaray because i believe i have candida and leaky gut.. i tried loading myself with vitamin c for a short period but decided not to pursue it as there a contradicting reports about its side effects especially kidney stones..