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4 min read
A guide to skincare acids and how to use them
Azelaic acid, AHAs and PHAs at higher concentrations appear to diminish hyperpigmentation. In summary, salicylic acid is an aromatic hydroxy acid, and AHAs, PHAs and ABAs are aliphatic. Hydroxyacids. At present, only vitamin A and aliphatic hydroxy acids have been shown to be topically effective for photoaging skin.