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Chemical Exfoliation (AHA/BHA/PHA)
Medically reviewed by ChokChok · Updated March 27, 2026
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The evidence-backed alternative to physical scrubs — acids that dissolve the bonds holding dead skin cells together, revealing smoother, brighter skin underneath without the micro-tears of scrubbing.
How It Works
AHAs (glycolic, lactic, mandelic acid) are water-soluble and work on the surface — ideal for texture, dullness, and fine lines. BHAs (salicylic acid) are oil-soluble and penetrate into pores — ideal for acne and blackheads. PHAs (gluconolactone, lactobionic acid) are larger-molecule acids with gentler exfoliation and added humectant properties — ideal for sensitive skin. All work by lowering skin surface pH, loosening desmosome bonds between dead cells.
What to Expect
Start 1x per week and increase frequency slowly over 4–6 weeks. Apply to clean, dry skin. Wait 20–30 minutes before layering other actives (especially retinol or niacinamide). SPF is mandatory the next morning — acids increase photosensitivity. Do not use with retinol on the same night as a beginner. Common products: COSRX AHA 7 Whitehead Power Liquid, Paula's Choice 2% BHA, Some By Mi AHA-BHA-PHA 30 Days Miracle Toner.
Deep Dive
Korea leads the world in accessible, well-formulated acid exfoliants. COSRX was one of the first mass-market brands to offer affordable AHA and BHA products. The K-beauty approach to acids is typically gentler than Western formulations — lower percentages, buffered pH, combined with soothing ingredients. PHA exfoliants are largely a Korean innovation, popularized as the sensitive-skin-friendly alternative.
Pros
- ✓ Strong evidence base for texture and pigmentation
- ✓ Accessible price points
- ✓ Addresses multiple concerns
- ✓ Synergistic with retinol (alternate nights)
Cons
- ✗ Purging period
- ✗ Must use SPF daily
- ✗ Over-exfoliation risk
- ✗ Sensitive skin may not tolerate
Risks & Side Effects
- ⚠ Increased sun sensitivity
- ⚠ Barrier damage from over-use
- ⚠ Avoid during pregnancy (high % glycolic)
✗
Pregnancy Safety
Avoid during pregnancy
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This is not medical advice. Always consult your healthcare provider or dermatologist before trying new treatments, especially in-clinic procedures.
Routines for Related Concerns
Step-by-step K-beauty routines that complement Chemical Exfoliation (AHA/BHA/PHA).
Products That Complement Chemical Exfoliation (AHA/BHA/PHA)
Products featuring the same key active ingredients — great for extending results between treatments.
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Frequently Asked Questions
How often should I do Chemical Exfoliation (AHA/BHA/PHA)?
2–3x per week (beginners: 1x). Most people see results within 4–8 weeks for texture improvement; 8–12 weeks for pigmentation.
Does Chemical Exfoliation (AHA/BHA/PHA) hurt?
The pain level for Chemical Exfoliation (AHA/BHA/PHA) is mild. Downtime: Possible initial purging (2–4 weeks).
Is Chemical Exfoliation (AHA/BHA/PHA) safe during pregnancy?
Chemical Exfoliation (AHA/BHA/PHA) should be avoided during pregnancy. Consult your healthcare provider about safer alternatives.
What are the risks of Chemical Exfoliation (AHA/BHA/PHA)?
The main risks and side effects to be aware of: Increased sun sensitivity; Barrier damage from over-use; Avoid during pregnancy (high % glycolic). Always consult a qualified provider, especially for in-clinic procedures.
How much does Chemical Exfoliation (AHA/BHA/PHA) cost?
Chemical Exfoliation (AHA/BHA/PHA) is in the budget-friendly range. Typical cost: $15–35 per product.
