Facial exfoliation: how to exfoliate skin without damaging it (AHA, BHA, PHA, and enzymatic)

Facial exfoliation is one of those steps that can completely transform your skin… or ruin it if you overdo it. In summer, with the heat, sweat, and excess sebum, the temptation to "scrub" for a brighter complexion is at its peak. But the key isn't to scrub harder, it's to exfoliate intelligently. In this article, our team of pharmacists explains what facial exfoliation is, what types exist, how often it should be done, and how to choose the most suitable method for your skin, especially during the sunniest time of the year.

What is facial exfoliation and what is it for?

Facial exfoliation is the process of removing dead cells that accumulate on the outermost layer of the skin (the stratum corneum). Our skin naturally renews itself approximately every 28 days, but with age, sun exposure, or dehydration, this cycle slows down, and those dead cells remain, dulling the tone and making the skin feel rough.

Proper exfoliation provides very specific benefits: brighter and more even skin, a smoother texture, less noticeable pores, and better absorption of the rest of your routine (serums and creams penetrate much better on skin free of "debris"). In short: exfoliation is the step that makes the rest of your products work better.

Physical vs. chemical exfoliation: which is better?

There are two main families of facial exfoliation, and understanding the difference is what separates a good result from irritated skin.

Physical (or mechanical) exfoliation

This is the traditional method: granules, seeds, clays, or brushes that remove dead cells by friction. It provides a satisfying immediate clean feeling and works well if the granules are fine and rounded. The risk appears when the particle is too abrasive (like some exfoliants with large crushed pits), which can cause micro-tears in the skin barrier. Well-formulated and gently used, physical exfoliation is a great option, especially for those looking for instant visible results.

Chemical exfoliation

Here, nothing is rubbed: these are mild acids that dissolve the "glue" that binds dead cells, so they shed on their own. This is the option most supported by dermatology because it is uniform and controllable. Within chemical exfoliation, we find the famous AHAs, BHAs, and PHAs.

AHA, BHA, and PHA: the quick guide to exfoliating acids

These three names appear in almost any modern facial exfoliation product. Here's how they differ:

• AHAs (alpha-hydroxy acids): The best known are glycolic, lactic, and mandelic acid. They are water-soluble and work on the skin's surface. Ideal for dullness, uneven texture, and early wrinkles. At concentrations of 5-10%, they improve texture, radiance, and skin tone uniformity.
• BHA (beta-hydroxy acid): Salicylic acid. It is fat-soluble, so it penetrates into the pore and dissolves accumulated sebum. The star option for oily, acne-prone skin or enlarged pores.
• PHAs (polyhydroxy acids): such as gluconolactone and lactobionic acid. They are the newest generation and have a larger molecule, so they penetrate less and exfoliate very superficially. Studies have shown that they cause much less irritation than AHAs, making them the best entry point for sensitive or reactive skin.

What about enzymatic exfoliation?

It's summer's great ally. Enzymes (usually from fruits like papaya or pumpkin) "digest" dead cells extremely gently, without strong acids or friction. They greatly respect the skin barrier and, since they don't increase photosensitivity like AHAs, they are perfect for exfoliating when there's more sun exposure. If your skin is sensitive or you simply don't want complications during beach season, start here.

How often should you exfoliate your skin?

The million-dollar question. The short answer: less is more. For most skin types, exfoliating 1 to 3 times a week is sufficient. If your skin is sensitive, dry, or reactive, once a week is more than enough. Oily or acne-prone skin can tolerate 2-3 times.

Over-exfoliation is one of the most common mistakes we see at the pharmacy. Warning signs: tightness, stinging when applying any product, redness, unexpected breakouts, or skin that "shines" strangely (that's not glow, that's a damaged barrier). If you recognize yourself, stop exfoliating and focus on hydrating and repairing for one or two weeks.

Facial exfoliation in summer: the precaution you should not skip

Here's the key warning. AHAs (glycolic, lactic) increase the skin's sensitivity to the sun. The FDA itself confirms this: after four weeks of AHA application, the skin's sensitivity to UV radiation-induced redness increased by 18%. The good news is that this effect is reversible and disappears approximately one week after discontinuing use.

What does this mean in practice? If you use AHA exfoliants in summer, sun protection is no longer optional; it becomes mandatory. In fact, the FDA requires a warning on these products recommending the use of sunscreen during use and up to one week afterward. Our pharmaceutical recommendation: always exfoliate at night and apply a broad-spectrum sunscreen every morning without exception. If you are not very consistent with SPF, prioritize enzymatic exfoliation or PHAs in summer, as they do not photosensitize.

How to exfoliate your skin step-by-step (pharmacist's routine)

1. Cleanse first. On clean, dry (or slightly damp, depending on the product) skin. Start with a good facial cleanse.
2. Apply the exfoliant according to the instructions. If it's physical, massage with very gentle circular motions, without pressing. If it's chemical or enzymatic, leave it on for the indicated time.
3. Rinse or remove depending on the format (exfoliating toners are not rinsed off).
4. Hydrate and repair. Apply your treatment serum and cream. Freshly exfoliated skin absorbs active ingredients better.
5. Protect yourself from the sun the next day, always.

Avoid exfoliating on sunburned skin, open wounds, active rosacea breakouts, or irritations. And never combine several strong exfoliants at once (for example, an AHA peel with retinol on the same night): that's the perfect recipe for damaging the barrier.

Our pharmacists' recommendation

Frequently asked questions about facial exfoliation

How many times a week should I exfoliate my face?

Between 1 and 3 times a week depending on your skin type. Sensitive or dry skin: once. Oily or acne-prone skin: 2-3 times. When in doubt, start with less and observe how your skin responds.

Can you exfoliate your skin in summer?

Yes, but wisely. Avoid strong AHAs if you won't be consistent with sunscreen, as they increase photosensitivity. During sunny seasons, prioritize enzymatic exfoliation or PHAs, exfoliate at night, and use SPF every morning.

What is better, physical or chemical exfoliation?

Neither is "better" in abstract: it depends on your skin. Chemical (AHA, BHA, PHA) is more uniform and supported by dermatology; physical gives immediate results and appeals to those looking for that clean feeling. The important thing is that both are used gently and without overdoing it.

How do I know if I'm over-exfoliating?

Signs of over-exfoliation: tightness, stinging, redness, unexpected breakouts, or a "strange" shine that is not radiance but a damaged barrier. If these appear, stop exfoliating and dedicate one or two weeks to hydrating and repairing.

Does exfoliation help with spots and pores?

It helps improve the appearance of both. By renewing the surface, the skin looks more even and pores less noticeable, and it facilitates better penetration of depigmenting active ingredients. It is not a miracle treatment, but it is a great ally within a complete routine.

Conclusion

Facial exfoliation is a simple gesture with a huge impact on skin radiance and texture, as long as it is done with good judgment: the right method for your skin type, the correct frequency, and, in summer, sun protection as non-negotiable. If you're torn between an enzymatic exfoliant, PHAs, or a gentle physical option, don't go in blind.

Discover your starting point with our free AI skin analysis or explore our entire selection of natural cosmetics for radiance and glow. And if you have any questions, our team of pharmacists is just a message away.

References

• FDA — Alpha Hydroxy Acids (Cosmetic Ingredients)
• FDA — Guidance for Industry: Labeling for Cosmetics Containing Alpha Hydroxy Acids
• Center for Research on Ingredient Safety (Michigan State University) — Sun Safety & Alpha-hydroxy Acids