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whats the diff between BP and SA?

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Alright, here we go. All bare-bones descriptions, but it'll give you the basics.

BP: Benzoyl peroxide. The key ingredient in countless acne-fighting medications (DKR, Proactiv, a ton of over-the-counter stuff, etc.), it's the only such ingredient proven to kill acne-causing bacteria.

SA: Salicylic acid. Another key ingredient in countless acne-fighting medications. SA is a chemical exfoliant, which basically means that it causes the outer-most layer of skin to shed and regenerate faster. For this reason it is most often recommended for comedonal acne. Mixing SA and BP is not recommended.

BHA: Beta hydroxy acid. It's an umbrella category, but for our purposes you can assume this is referring to salicylic acid.

AHA: Alpha hydroxy acid. Another umbrella category, but this one you have to be more careful about. You'll mostly be hearing about glycolic acid, but a few others do exist in skin care, including lactic acid. This is another exfolatior; AHA is closely linked to BHA/salicylic acid.

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