Eliminating dairy completely from my diet has cleared my acne 95%. For a while I had eliminated all dairy except butter, which I liked to cook with. However, I found that even butter was behind my severe back acne. In my view, the key is to make sure that everything that you are ingesting is free of dairy and milk products.<br/>When I go out to eat, I make sure that the dishes that I order do not have dairy, or I go to a vegan restaurant to be 100% sure. I've had moderate to severe acne since my teenage years (I'm now 28), so such an unpleasant dietary change I am willing to do for clear skin.