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    AnswerYes. Most skin does best with them at different times: BHA in the morning, AHA at night.

    Toners, pads, washes and serums often pack an AHA and a BHA into one product. Here is how to choose between the two acids, how to size up a combined product by its format and label, and how to tell purging from plain irritation.

    Lab reportGl × Sa · reviewed November 8, 2026
    VerdictTwo exfoliants: go slowSpace out
    WhyBoth acids peel away dead skin cells, so layering them can stack up stinging and redness. Both can also make skin more sensitive to sun. Using them at different times is gentler.
    MorningSalicylic acid product SPF 30+
    NightGlycolic acid at night, on its own moisturizer
    StartStart with one acid. Add the other only if skin stays comfortable.
    Both at onceSome routines do layer them, for example a salicylic acid wash that rinses off, then a glycolic acid lotion. If you get stinging, redness or peeling, stop one and let your skin settle.

    What each one does

    Glycolic acid · AHA

    What AHA does

    An alpha hydroxy acid (AHA) that loosens dead skin cells on the surface. It can sting and makes skin more sensitive to the sun.

    Usual over-the-counter strength: up to 10%

    Salicylic acid · BHA

    What BHA does

    A beta hydroxy acid (BHA) sold over the counter for acne. It can dry skin, so labels say to start once a day.

    Usual over-the-counter strength: 0.5–2%

    AHA or BHA: which one does your skin need?

    • BHA (salicylic acid) for clogged pores. It’s oil-soluble, gets deeper into pores than AHAs do and dissolves sebum, which is why Cleveland Clinic calls it a good choice for blackheads and whiteheads. It’s also an FDA-approved over-the-counter acne ingredient.
    • AHA (glycolic or lactic acid) for the surface. AHAs are water-soluble and don’t reach as deep. Cleveland Clinic says glycolic acid smooths the skin’s surface and helps with discoloration and fine lines, but can be very strong and irritating. Lactic acid is one of the gentler AHAs, the one Cleveland Clinic suggests for sensitive skin.
    • Oily skin: the AAD lists salicylic, glycolic and lactic acid among ingredients that can help reduce oiliness.

    Only need one? Start there. Cleveland Clinic’s advice is to use one product for a while and see how your skin reacts before adding another, or you won’t know which one is helping.

    SourcesFDA OTC acne monograph, 21 CFR 333.310Cleveland Clinic: Facial acids, know what you need (Samantha Stein, PA-C, March 2023)American Academy of Dermatology: How to control oily skin (updated Sep 2024)

    Toner, pads, wash or serum: how strong is it?

    A wash rinses off; a toner, pad or serum stays on until your next cleanse. Mayo Clinic notes salicylic acid comes in both leave-on and wash-off forms, so check which kind you have before you plan the rest of the routine.

    Strength is the other half. An industry safety panel, cited by the FDA, found glycolic and lactic acid safe in consumer products at 10% or less, with a final pH of 3.5 or higher. The FDA adds that the most serious reactions came from the products that exfoliate the most, such as “skin peelers.” A high-percentage AHA/BHA peel is not the same thing as a daily toner.

    • On the label: AHAs include glycolic, lactic and citric acid. BHAs include salicylic acid and its relatives, such as salicylate, sodium salicylate and willow extract.
    • How often: the AAD’s rule of thumb is that the more aggressive the exfoliation, the less often you need it.
    • Darker skin tones: the AAD advises avoiding strong chemical exfoliation.
    • Right after: moisturizer, the AAD says, to keep skin hydrated.

    SourcesFDA: Alpha Hydroxy AcidsFDA: Beta Hydroxy AcidsMayo Clinic: Nonprescription acne treatment (2024)American Academy of Dermatology: How to safely exfoliate at home (updated Feb. 2026)

    Purging or irritation?

    Small breakouts in your usual spots after you start an acid can be purging. Cleveland Clinic calls it normal and says it can last a few weeks, and that it’s often mistaken for a breakout or an allergic reaction.

    Its dividing line: keep going as long as the products aren’t heavily irritating your skin or causing a lot of stinging, itching or redness.

    • Stinging that lingers: the FDA says to stop a BHA product if you get irritation or prolonged stinging.
    • Red, raw skin: that’s over-exfoliation, the AAD says. Never exfoliate skin that is sunburned or has open cuts.
    • Not sure which you have? Try the purging or breakout checker.

    SourcesFDA: Beta Hydroxy AcidsCleveland Clinic: Facial acids, know what you need (Samantha Stein, PA-C, March 2023)American Academy of Dermatology: How to safely exfoliate at home (updated Feb. 2026)

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    Questions people ask

    Can I use AHA/BHA products while pregnant?

    Ask your OB-GYN, because sources disagree on glycolic acid. A dermatologist in the AAD's pregnancy guide suggests glycolic acid in the evening, while InfantRisk Center advises avoiding it until more research is done. InfantRisk considers topical salicylic acid safe, and a 2026 review summarized by Dermatology Times says salicylic acid peels are avoided in pregnancy. Our pregnancy-safe check shows where each source lands.

    SourcesAmerican Academy of Dermatology: Dermatologist-approved pregnancy skin care (updated June 2025)InfantRisk Center: An overview of the safety of skin care products during pregnancy (2020)Dermatology Times (Sept. 2026) on Kovacs et al., Int J Dermatol, 2026 (news summary only)

    How often should I use each acid?

    Differently. Cleveland Clinic says most people can use salicylic acid twice a day, while glycolic acid should start once or twice a week at night. That's why the plan on this page keeps BHA daily and brings AHA nights in slowly.

    SourceCleveland Clinic: Facial acids, know what you need (Samantha Stein, PA-C, March 2023)

    Can I follow an AHA/BHA with niacinamide or hyaluronic acid?

    Yes. The AAD says to apply moisturizer right after exfoliating, and both are rated fine in the same routine with glycolic acid and with salicylic acid in our mixer. See niacinamide + salicylic acid for the order.

    SourceAmerican Academy of Dermatology: How to safely exfoliate at home (updated Feb. 2026)

    Can I use an AHA/BHA with retinol?

    Not on the same night when you're starting out. Cleveland Clinic advises against using glycolic acid with retinol at first, and the AAD warns that exfoliating while using a retinoid can worsen dry skin or even cause breakouts. Our retinol + glycolic acid and retinol + salicylic acid guides show how to space them.

    SourcesAmerican Academy of Dermatology: How to safely exfoliate at home (updated Feb. 2026)Cleveland Clinic: Glycolic acid: benefits for skin and how to use (Nov. 2025)

    Sources

    11 sources · Last reviewed November 8, 2026

    • Evidence for this pair: expert consensus (no study or label tested this advice directly)
    How we check

    American Academy of Dermatologyaad.org

    US Food and Drug Administrationfda.gov

    • Alpha Hydroxy Acids (2022)

      AHAs raise UV sensitivity; strongest exfoliants caused the worst reactions. The CIR panel found glycolic and lactic acid safe for consumers at 10% or less with a final pH of 3.5 or greater; serious reactions occurred most with the most exfoliating products such as skin peelers; common AHAs are glycolic, lactic and citric acid, among others.

    • Beta Hydroxy Acids (2022)

      Stop if irritation or stinging; use sun protection. BHAs include salicylic acid (or salicylate, sodium salicylate, willow extract); stop if irritation or prolonged stinging.

    Cleveland Clinicclevelandclinic.org

    • Facial acids, know what you need (Samantha Stein, PA-C, March 2023)

      AHAs are water-soluble; BHAs are oil-soluble, penetrate deeper into pores and dissolve sebum, so salicylic acid suits blackheads and whiteheads; glycolic acid smooths the surface and helps discoloration and fine lines but can be very strong, start once or twice a week at night; lactic acid is gentler, good for sensitive skin; salicylic acid can be used twice a day by most; use one product a while before adding another; purging is normal, can last a few weeks, is often mistaken for a breakout or allergy, fine unless heavy stinging, itching or redness.

    • Glycolic acid: benefits for skin and how to use (Nov. 2025)

      When first starting, avoid using glycolic acid with other exfoliants, retinol and vitamin C serums.

    Mayo Clinicmayoclinic.org

    • Nonprescription acne treatment (2024)

      One product in the morning, another at night, to prevent irritation. Salicylic acid is available from 0.5% to 2% as both leave-on and wash-off products.

    Electronic Code of Federal Regulationsecfr.gov

    InfantRisk Center, Texas Techinfantrisk.com

    Studies and other sources