Can AHAs/BHAs exfoliants help with acne or scarring? Yes, AHAs like glycolic acid help resurface skin to fade the look of post-blemish dark spots, smooth texture, and boost cell turnover, helping scars appear less visible over time. BHAs like salicylic acid penetrate deep into pores to clear congestion, fight blemishes, and help prevent new blemishes that can lead to future dark spots & discoloration in the future. How often should AHAs/BHAs exfoliants be used? Most AHAs/BHAs exfoliants are used 2–3 times per week to clear pores and smooth skin. Sensitive skin should start once weekly and increase frequency as tolerated. AHAs and BHAs should not be used at the same time—alternate days to avoid over-exfoliation and barrier damage. What skin types are different aha lotions suitable for? AHA lotions are suitable for most skin types. Glycolic acid works best for normal to oily skin needing texture and tone improvement, while lactic or mandelic acid is ideal for dry or sensitive skin, offering gentle exfoliation with added hydration and barrier support. What are key ingredients in bha liquid exfoliants? Key ingredients in a BHA liquid exfoliant should include hydrators like glycerin, hyaluronic acid, or propanediol to help prevent dryness. Calming, oil-balancing ingredients like niacinamide or green tea extract can further reduce redness and improve overall skin clarity. Paula’s Choice SKIN PERFECTING 2% BHA Liquid Exfoliating Toner includes propanediol for hydration and green tea extract to help soothe and visibly reduce redness.