Acids, Explained: What Your Skin Actually Needs
Acids are one of the most effective tools in skincare, but they’re also one of the most misunderstood. They are not meant to sting, peel, or shock your skin into behaving. When chosen correctly, acids support gentle renewal, smoother texture, clearer pores, and healthier-looking skin over time.
The key is understanding what each type of acid does and choosing the one that works with your skin, not against it.
AHAs | Alpha Hydroxy Acids
AHAs are water-soluble acids that work on the surface of the skin. Their main role is to loosen dead skin cells so they shed more evenly, which helps improve brightness and texture.
Common AHAs you’ll see on ingredient lists:
- Lactic acid
- Mandelic acid
- Glycolic acid
- Citric acid
- Tartaric acid
What they help with:
- Dull or uneven skin tone
- Rough texture
- Dryness and lack of glow
What to know:
Lactic and mandelic acids are generally gentler and better tolerated, especially for dry or sensitive skin. Glycolic acid penetrates more deeply and should be used more cautiously. Citric and tartaric acids are often included to support exfoliation and maintain formula balance.
BHAs | Beta Hydroxy Acids
BHAs are oil-soluble acids, meaning they can travel through oil and into the pore. This makes them especially effective for congestion and breakouts.
The primary BHA used in skincare:
- Salicylic acid
What it helps with:
- Blackheads and whiteheads
- Congested pores
- Oily or acne-prone skin
What to know:
Salicylic acid was originally derived from willow bark and works inside the pore to help clear buildup. Because it is powerful, overuse can lead to dryness and barrier disruption, which may worsen breakouts over time.
PHAs | Polyhydroxy Acids
PHAs are considered the gentlest exfoliating acids. They have a larger molecular structure, which allows them to work more slowly and with less irritation.
Common PHAs:
- Gluconolactone
- Lactobionic acid
- Galactose
What they help with:
Sensitive or reactive skin
Compromised skin barriers
Early signs of texture without irritation
What to know:
PHAs exfoliate while also attracting moisture, making them ideal for skin that cannot tolerate stronger acids. They are a great option for beginners or anyone easing back into exfoliation.
How Often Should You Use Acids
With acids, more is not better. Consistency matters more than strength.
- AHAs are typically best used one to two times per week
- BHAs are often tolerated two to three times per week
- PHAs can usually be used up to three times per week
If your skin stings when applying basic products, exfoliation should be paused entirely until the skin barrier is restored.
How to Choose What’s Right for You
If you’re new to acids, starting gently is always the smarter choice. Skin responds best when it feels supported, not pushed. For many people, that means beginning with a PHA or a mild AHA and allowing the skin time to adjust before introducing anything stronger.
If congestion or breakouts are your primary concern, a BHA used a few times per week may be more effective. If dullness, dryness, or uneven texture are what you’re trying to address, an AHA can help improve clarity and smoothness when used intentionally.
No matter which acid you choose, exfoliation should feel controlled and comfortable. Healthy skin does not burn, sting, or feel tight after use. When in doubt, less frequency and gentler formulas almost always lead to better long-term results.
Disclaimer
For informational purposes only. Individual skin responses may vary. Always perform a patch test prior to use, especially if you have sensitive skin or known allergies. Discontinue use if irritation occurs. This content is not intended to diagnose, treat, or replace professional medical advice or in-office care.