[timonovici]

I have some personal anecdotes that support this to some degree - I have dermatitis, and acne on my forearms - the longer I fast, the less acne I have, and my dermatitis recedes. The effects are very visible, and quite quick, 2 days of fasting will completely clean my scalp.

My father had psoriasis - after a week of fasting, his scabs would completely disappear, even in winter, when he had the worse flare-ups. Even eating healthy, even avoiding all sorts of foods that he knew he was sensitive to (lemons, garlic, spices, etc) didn't have nearly the same effect.