RRevelika
exfoliant

Salicylic Acid (BHA)

INCI · Salicylic Acid · also BHA, Beta Hydroxy Acid

EWG safety

How it works

Salicylic acid is a beta-hydroxy acid that, unlike the water-soluble AHAs, is lipophilic — it dissolves in oil. That property lets it penetrate directly into sebum-filled pores, where it exfoliates the inside of the follicle wall and helps clear the buildup of dead cells and oil that leads to blackheads and inflammatory acne.

It also has intrinsic anti-inflammatory activity, related to its chemical kinship with aspirin, which helps calm the redness that accompanies active breakouts. This dual action — inside-the-pore exfoliation plus calming — is what separates it from surface-acting AHAs, and it's the reason I reach for it first for congested, oily skin rather than an AHA.

The evidence

Clinical trials on BHA formulations have consistently shown reductions in comedone counts and inflammatory lesions over 4–12 weeks, with a favorable side-effect profile compared to more aggressive acne treatments. It's frequently used as a foundational over-the-counter option before escalating to prescription-strength acne therapy, and dermatology guidelines commonly list it as an adjunct to first-line retinoid or benzoyl peroxide regimens.

Suitability

  • Oily and acne-prone skin: the standout exfoliant for pore congestion and blackheads
  • Combination skin: often used as a targeted treatment on the T-zone
  • Not a first-line choice for very dry or highly reactive skin without careful concentration control
  • Enlarged pores: reduces the look of congestion with consistent use

Concentration

Over-the-counter formulas are typically capped at 2%, which is the concentration with the best clinical support for at-home use. In-office peels use higher concentrations under supervision. I recommend starting with a leave-on 0.5–1% product for beginners and increasing frequency gradually as tolerance builds.

Conflicts & combinations

  • Avoid layering with retinol, glycolic acid, or benzoyl peroxide — the combined irritation risk is significant and rarely worth it
  • Pairs well with niacinamide and zinc PCA for oil control without added exfoliation
  • Increases sun sensitivity, so daily SPF is non-negotiable
  • Spot treatments can be layered locally even when a full-face acid routine isn't tolerated
Suitability
Suits skin type
dry oily combo sensitive acne prone mature normal
Targets
  • acne
  • enlarged pores
  • uneven texture
Use caution with
  • dryness
Concentration
Concentration0 – 5%
Effective from
2%
Max safe
2%
Pairs well with
Frequently asked
What does salicylic acid do for acne?

It penetrates oily pores to dissolve the buildup of dead skin and sebum that causes blackheads and breakouts, while also calming inflammation.

Can I use salicylic acid every day?

Many people tolerate daily use at 0.5–2%, but those new to it should start every other day.

Is salicylic acid safe during pregnancy?

Oral salicylates are avoided in pregnancy; low-concentration topical use is generally considered lower risk but should be confirmed with your doctor.

Can you use salicylic acid and niacinamide together?

Yes, this is a well-tolerated and commonly recommended combination for oily, acne-prone skin.

What's the difference between salicylic acid and glycolic acid?

Salicylic acid is oil-soluble and works inside pores, making it better for acne and blackheads, while glycolic acid is water-soluble and works on the surface, making it better for texture and tone.

The evidence