RRevelika
brightening

Azelaic Acid

INCI · Azelaic Acid · also Nonanedioic Acid

EWG safety

How it works

Azelaic acid is a naturally occurring dicarboxylic acid, originally isolated from grains like wheat and rye, and it is one of the few actives in my formulary that does three jobs at once. It normalizes keratinization inside the follicle, which prevents the plugging that leads to comedones; it directly inhibits the bacterium Cutibacterium acnes; and it selectively targets overactive melanocytes, which is why it evens tone without bleaching normal skin.

That selectivity for hyperactive pigment cells is what makes it useful for both post-inflammatory marks and the background redness of rosacea, where it also calms inflammatory pathways.

The evidence

Randomized trials on 15–20% azelaic acid formulations have shown efficacy comparable to benzoyl peroxide and tretinoin for mild-to-moderate acne, and comparable to hydroquinone for melasma in some head-to-head studies, with a better tolerability profile. Rosacea trials support 15% gel or foam for reducing papules, pustules, and erythema over 12 weeks.

Suitability

  • Acne-prone skin: reduces breakouts and the marks they leave behind
  • Rosacea and reactive skin: calms redness and visible vessels
  • Melasma and post-inflammatory hyperpigmentation: safe, non-bleaching brightening option
  • Pregnancy and breastfeeding: one of the few actives with an established safety record

Concentration

Over-the-counter formulas typically run 10%, while prescription-strength gels and creams reach 15–20%. I usually start patients at 10% to build tolerance, since the initial week can bring transient stinging or flaking, then move up if needed. Results for pigmentation and acne both take 8–12 weeks of consistent use to become obvious.

Conflicts & combinations

  • Pairs well with niacinamide for extra barrier support and with tranexamic acid for stubborn melasma
  • Can be layered with salicylic acid for oily, acne-prone skin, though I'd introduce them on alternate nights initially
  • Generally well tolerated alongside retinoids, but combining two potentially irritating actives at once warrants a slow start
  • Safe under mineral or chemical sunscreen with no known photosensitizing interactions
Suitability
Suits skin type
dry oily combo sensitive acne prone mature normal
Targets
  • acne
  • hyperpigmentation
  • redness
  • uneven texture
Concentration
Concentration0 – 20%
Effective from
15%
Max safe
20%
Frequently asked
Is azelaic acid safe during pregnancy?

Yes, azelaic acid is one of the acne and pigmentation treatments considered safe throughout pregnancy and breastfeeding.

Can azelaic acid replace hydroquinone?

For many patients it offers comparable brightening with less irritation risk, though severe melasma may still need a dermatologist-guided combination approach.

Does azelaic acid help rosacea?

Yes, 15% azelaic acid gel is a well-studied treatment for rosacea-related redness and bumps.

How long until azelaic acid shows results?

Most people see improvement in acne within 4 weeks and pigmentation fading over 8–12 weeks.

Can I use azelaic acid with vitamin C?

Yes, the combination is generally well tolerated and can enhance brightening, though patch testing is wise for sensitive skin.

The evidence