Both alpha hydroxy and beta hydroxy acids exfoliate skin to prevent dead skin cells from building up and clogging pores, but while alpha hydroxy acid is water soluble only, beta hydroxy acid (salicylic acid) is oil soluble, so it's able to really seep into the sebum-packed pore, exfoliating the dead skin cells built up inside. Look for products that contains salicylic acid. If you have combination skin, you can find products like Murad's Exfoliating Acne Treatment Gel, which contains both salicylic and glycolic acid.
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