If you have acne, the dietary recommendations I will give are the following: a trial of gluten and casein and sugar free for one month. Avoid all sodas, fruit juices, junk food, processed and packaged foods. Eat more whole foods.
In addition I will test for food intolerances and candida. Uncovering omega 3 fatty acids can also be of use in acne patients. Occasionally I will see women with undiagnosed PCOS and severe acne, which can be responsive to a very safe water pill and androgen blocker called spironolactone.
Books to read:
The Paleo Diet, by Dr. Cordain