Quick answer
For active acne and clogged pores, salicylic acid is more effective. For post-acne marks and uneven texture, glycolic acid is the better choice. Many routines benefit from both, used at different times.
How they work on acne
Salicylic acid is oil-soluble, so it penetrates deep into pores to dissolve sebum and dead skin cells that cause blackheads and whiteheads. This makes it ideal for treating existing breakouts and preventing new ones.
Glycolic acid is water-soluble and works on the skin's surface. It exfoliates the top layer to smooth texture, fade hyperpigmentation, and brighten skin. It is less effective at unclogging pores but excellent for improving overall skin tone and reducing the appearance of acne scars.
Choosing based on skin type
Oily and combination skin often responds best to salicylic acid because it targets excess oil inside the pore. Dry or sensitive skin may prefer glycolic acid in a gentle formulation, as it can be less irritating when used correctly.
If you have both active acne and post-inflammatory hyperpigmentation (dark spots), you may benefit from using salicylic acid on active breakouts and glycolic acid on the rest of your face, but never at the same time.
Trade-offs at a glance
- Salicylic acid for active acne: Best for oily skin, blackheads, whiteheads, and papules. It penetrates pores to clear blockages and reduce inflammation. Use a salicylic acid cleanser or leave-on treatment on affected areas daily.
- Glycolic acid for post-acne marks: Best for dull skin, uneven texture, and hyperpigmentation left by healed breakouts. It resurfaces the skin over time. Start with the Good Molecules Glycolic Exfoliating Toner 2-3 times per week, then increase as tolerated.
- Using both in one routine: Do not layer them at the same time. Use salicylic acid in the morning and glycolic acid at night, or alternate days. Monitor for signs of over-exfoliation like redness or stinging, and scale back if needed.
Product comparison
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Good Molecules Glycolic Exfoliating Toner 120ml: Glycolic Exfoliating Toner combines glycolic acid with galactomyces ferment to exfoliate dead skin cells and reveal smoother, brighter skin. This toner is best for fading acne marks and improving overall skin texture, rather than treating active pimples.
Good Molecules Glycolic Exfoliating Toner 120ml
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Good Molecules Pimple Patches 60ct: Pimple Patches are ultra-thin hydrocolloid patches that reduce impurities and conceal breakouts that have come to a head. Use these as a spot treatment for whiteheads and pustules; they work best after cleansing and before moisturizer.
Good Molecules Pimple Patches 60ct
Which one fits your skin?
Best for
- Salicylic acid: oily skin with active breakouts and clogged pores
- Glycolic acid: normal to dry skin with post-acne marks and uneven texture
Not for
- Salicylic acid: very dry or sensitive skin, or if you are already using a strong retinoid
- Glycolic acid: open wounds, active cystic acne, or if you have never used chemical exfoliants before
