Exfoliating acids can transform how skin looks — smoother, clearer, brighter — but only if you pick the right one and use it sparingly. The two big families are AHAs and BHAs, and they suit different skin and different concerns. Here's a simple guide to AHA vs BHA, so you know which exfoliant your skin actually needs and how often to use it.
Quick Answer
AHAs are water-soluble acids that work on the skin's surface to smooth texture and brighten dull, uneven tone. BHAs are oil-soluble and go deeper into the pore to clear oil and blockages, which makes them the better pick for oily and acne-prone skin. If your main concern is breakouts and shine, choose a BHA; if it's dullness and rough surface texture, an AHA. Whichever you use, go slow — a few times a week — and never skip sunscreen.
What AHAs and BHAs actually do
AHA stands for alpha hydroxy acid (like glycolic or lactic acid). These are water-soluble and work on the surface, loosening dead skin so fresher, more even-looking skin shows through — great for dullness, rough texture and uneven tone. BHA means beta hydroxy acid — most commonly salicylic acid. It's oil-soluble, so it can get inside the pore to dissolve the oil and debris that lead to clogging and breakouts.
AHA vs BHA at a glance
| AHA | BHA | |
|---|---|---|
| Soluble in | Water | Oil |
| Works on | Skin surface | Inside the pore |
| Best for | Dullness, rough texture, uneven tone | Oily, acne-prone skin, clogged pores |
| Example | Glycolic, lactic acid | Salicylic acid |
| Sun sensitivity | Higher — SPF essential | Lower, but still wear SPF |
Which should you use?
For oily and acne-prone skin — very common in our climate — a BHA like salicylic acid is usually the better choice, because it clears inside the pore where breakouts start. If your skin is more normal-to-dry and your concern is dullness or rough patches, an AHA suits better. Some people use both on different days, but if you're starting out, pick the one that matches your main concern and keep the rest of the routine gentle. If breakouts are your focus, pairing gentle exfoliation with a daily clarifying serum for acne-prone routines keeps oil in check between exfoliating days.
How often to exfoliate
- Start slow — once or twice a week, not daily.
- Use it at night, on clean skin, before moisturiser.
- Build up gradually only if your skin stays comfortable.
- Always follow with moisturiser, and wear SPF 50 every morning — acids can make skin more sun-sensitive.
- Don't layer acids with other strong actives on the same night when you're new to them.
Common exfoliation mistakes
Over-exfoliating is the big one — using acids too often leaves skin red, tight and sensitised, which is a sign to pull back, not push harder. Other slips: scrubbing on top of acids, skipping sunscreen, and mixing too many actives at once. Gentle and occasional beats aggressive and daily. Patch test any new acid first, especially on sensitive skin.
Frequently Asked Questions
Is AHA or BHA better for acne?
BHA (salicylic acid) is usually better for acne because it's oil-soluble and clears inside the pore, where breakouts begin. AHAs work more on surface texture and tone.
Can I use AHA and BHA together?
Some people do, on alternate days. If you're new to acids, it's gentler to start with just one that matches your main concern and add the other later, if at all.
How often should I exfoliate?
Once or twice a week to start. Exfoliating too often irritates the skin, so slow and steady is the safer approach.
Do I need sunscreen if I use exfoliating acids?
Yes, always. Acids can make skin more sensitive to the sun, so daily SPF is essential to protect it and your results.
Explore BiBiJoon
Products mentioned: Flux Acne Free Clarifying Serum · Solv Care SPF 50. Browse the serums collection to build a gentle routine.
Related reading: How to Get Rid of Acne and Breakouts · How to Minimize Large Pores
Last updated: July 2026. This article is general skincare education, not medical advice. For persistent or concerning skin conditions, consult a qualified dermatologist.
