23 Jul
"Just use an acid" is common skincare advice, but AHA and BHA are not interchangeable they work differently, suit different skin concerns, and picking the wrong one is a common reason people don't see results, or end up irritated. Here's the difference, in plain terms.
The Core Difference: Water-Soluble vs Oil-Soluble
AHAs (Alpha Hydroxy Acids) — like Glycolic Acid and Lactic Acid are water-soluble, meaning they work primarily on the skin's surface, exfoliating dead skin cells to improve texture, tone, and dullness.
BHA (Beta Hydroxy Acid) — Salicylic Acid is the main one used in skincare is oil-soluble, meaning it can penetrate into oily pores themselves, making it especially effective for clogged pores and blackheads.
This single distinction determines which one suits your main concern.
Glycolic Acid: Best for Texture and Dullness
Glycolic Acid has the smallest molecule size among common AHAs, meaning it penetrates a bit deeper and tends to be the most noticeably effective for rough texture, dullness, and mild sun damage. It can also be slightly more likely to cause irritation in sensitive skin because of that same penetration.
Best for: Dry to normal skin dealing with dullness, uneven texture, or early fine lines.
See our Glycolic Acid collection.
Lactic Acid: The Gentler AHA
Lactic Acid has a larger molecule size than Glycolic Acid, meaning it doesn't penetrate quite as deeply, making it a gentler entry point into AHAs for people with sensitive or reactive skin. It also has some added hydrating benefit compared to Glycolic Acid.
Best for: Sensitive or dry skin wanting AHA benefits without as much irritation risk.
Salicylic Acid: Best for Oily and Acne-Prone Skin
Because it's oil-soluble, Salicylic Acid can get inside oily, congested pores in a way AHAs generally can't, making it the more effective choice for blackheads, whiteheads, and oil-related congestion a common concern in Sri Lanka's humid climate.
Best for: Oily, acne-prone, or congestion-prone skin.
See our Salicylic Acid collection.
Can You Use Both?
Yes, but not necessarily on the same night, especially when starting out. A common, lower-risk approach is alternating: Salicylic Acid on one night, an AHA on another, giving skin recovery time between actives rather than stacking them together.
Why Sri Lanka's Climate Changes the Calculation
Humidity and heat mean oil production tends to run higher here on average, which is part of why Salicylic Acid is such a popular, effective choice locally. That said, air conditioning exposure and over-cleansing can still leave skin dehydrated even in a humid climate so "oily" doesn't automatically rule out needing the gentler hydration support that Lactic Acid offers.
How to Introduce Any Exfoliating Acid Safely
- Start with 2-3 uses per week, not daily
- Always use at night — exfoliating acids increase sun sensitivity
- Never skip morning SPF the next day (see our Neutrogena sunscreen range)
- Don't combine with Retinol on the same night while your skin adjusts
- Follow with a moisturizer to offset any dryness, especially with Glycolic Acid
A Simple Way to Decide
- Oily, acne-prone, blackhead-focused → Salicylic Acid
- Dry or normal skin, dullness, and texture → Glycolic Acid
- Sensitive skin wanting a gentle starting point → Lactic Acid
Where to Start
Browse our Glycolic Acid and Salicylic Acid collections, sourced through authorized channels and shipped island-wide.
