Salicylic Acid Free Diet are for people who were tested to be allergic to salicylates, they are in turn making their diet free from acetyl-salicylates or salicylic. Salicylic acid or what we call benzoyl peroxide may indeed cure certain types of acne, however, it may also give out some dangerous allergic side-effects causing dryness, itchiness, slightly swelling and redness. It is why when we notice these reactions to our skin then we should consult our doctors or try the Salicylic acid diet. This is done for 14 to 21 days. Please see details here http://www.naturaltherapies.com/allergies-2/