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In page Chemical peel:

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Salicylic acid is a beta hydroxy acid. It is antibacterial (mostly bacteriostatic, except in high concentrations when it is more frequently bactericidal) and anti-inflammatory which helps treat acne. Salicylic acid also has the ability to reduce the spots and bumps associated with acne.[1] It is becoming common for beta hydroxy acid (BHA) peels to be used instead of the stronger alpha hydroxy acid (AHA) peels due to BHA's being oil soluble.[2] Studies show that BHA peels control sebum excretion, acne as well as remove dead skin cells to a certain extent better than AHAs[citation needed] due to AHAs only working on the surface of the skin.