Does anyone else here have seborrheic dermatitis? I found, through trial and error, that mine was the result of a biotin deficiency. It was very bad ever since my 20's and kept getting worse. I started taking 2000mcg but found I needed to take 10,000mcg a day for it to go into total remission. I want to say it was very bad; my scalp would scab and my face (eyebrows, forehead, cracks of nose, and cheeks) would be very red, scaly and inflammed. The does was confirmed to me by a doctor who studies "partial biotinidase deficiency". But once I had my genetics we were able to see it in my biotinidase genes and in a gene called HLCS! It turns out it is caused by a yeast called Malassezia that lives off of a certain type of skin oil/fat. It seems when people have a biotin deficiency it will create more of that fat so the yeast thrives.