Salicylic acid, a beta-hydroxy acid derived from willow bark, remains the most effective OTC ingredient for acne and congested pores. Its oil solubility allows it to penetrate inside pores and dissolve sebum plugs. Concentrations of 0.5-2% are most effective, found in classics like Paula's Choice BHA Exfoliant and CeraVe Acne Foaming Cream Wash.
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