I used the McDougall Elimination Diet to discover the diet that works for me: http://anti-itisdiet.blogspot.com/2007/ ... foods.html
Before I started my particular subset of the McDougall Regular diet, I had acne (surface and below the surface), eczema, seborrheic dermatitis, and rosacea -- as well as a host of other inflammation problems, as shown here: http://anti-itisdiet.blogspot.com/2007/ ... ation.html
I got rid of perhaps 98% of my skin problems, gradually, by eating only alkaline-producing foods: fruits, vegs, and root and gourd starches.
I got rid of the last of my skin problems (perhaps 99.9%, if I had to put a number on it) by switching to using sulphur as my standard: http://anti-itisdiet.blogspot.com/2011/ ... ssful.html
I now eat only very low sulphur foods: http://anti-itisdiet.blogspot.com/2010/ ... i-eat.html
Keys to success: I never make exceptions. I never jump off the wagon. I assume 100% compliance with my particular diet is the norm.