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What is Salicylic Acid?Salicylic Acid, as Merriam-Webster defines it, is: a crystalline phenolic acid C7H6O3 that is used medicinally, especially as a skin exfoliant and in the form of salts and other derivatives as an analgesic and antipyretic. It is a natural compound found mainly in the bark of willow trees but is also present in other plants. Unlike alpha-hydroxy acids, which is water-soluble and only exfoliates the surface of the skin, sa...