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Essentially, clean up your diet, drink lots of water, try to determine and cut out any food types which you may have a slight allergy to (sometimes things such as bread, or sugar, or yeast, or dairy, may bring you out in the odd spot or two - not a full allergic reaction but enough to give you a bit of acne), and then hope you're of the right age and have the right genes - a lot of acne is hormonal or inherited, so there's not all that much you can do about it anyway.
To fight with acne and also with different skin problems you should drink a lot of clean water (really A LOT). All my doctors and nutritionists say that. If you have an allergy you need to find out on what. Well, I have cheese allergy and from all kind of cheese I have these red rash in form of blisters (bleh

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http://stopallergyguide.com/cheese-allergy/ and one of really good advises is to to drink kefir, yogurt and other drinks to prevent intestinal disorders, as they are able to normalize the intestinal microflora. Diet is very helpful to save your skin clean and smooth.