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Skin Actives

Azelaic Acid

Also known as: Nonanedioic acid, AzA

A multitasking acid for acne, rosacea, and dark spots — and one of the few actives considered safe in pregnancy.

  • By IngredientWiki Editorial Team
  • Fact-checked by IngredientWiki Editorial Team
  • Updated 2026-09-26
  • 2 min read

In short

Azelaic acid is a naturally occurring dicarboxylic acid — produced by skin yeast and found in grains — used in skincare as a gentle, multitargeted active. It unclogs pores, kills acne bacteria without resistance, calms rosacea redness, and fades dark spots by inhibiting tyrosinase. Prescription strength is 15–20% (Finacea), while 10% formulas are OTC. Its standout feature: it is one of the few acne actives widely considered safe during pregnancy.

  • Naturally occurring acid with antibacterial and brightening actions
  • Treats acne, rosacea, and hyperpigmentation at once
  • OTC strength: 10%; prescription: 15–20%
  • Widely considered pregnancy-safe, unlike retinoids

What is Azelaic Acid?

Azelaic acid is the skincare overachiever that never quite became a household name. It is naturally produced by the Malassezia yeast living on everyone's skin and has been a prescription acne drug since the 1980s. Its triple action — antimicrobial, comedolytic, and pigment-blocking — makes it uniquely suited to skin that has everything: breakouts, redness, and leftover dark marks. It is also gentle enough to combine with retinoids, a rare quality among actives.

Where it comes from

Natural sources

  • Produced naturally by Malassezia yeast on human skin
  • Found in wheat, rye, and barley
  • Industrial production for cosmetics from oleic acid (often from castor oil)

How it's made

Cosmetic and pharmaceutical azelaic acid is produced by oxidation of oleic acid.

What it does in products

  • Antibacterial against Cutibacterium acnes (no resistance)
  • Normalizes pore-lining cell shedding (anti-comedonal)
  • Inhibits tyrosinase to fade dark spots
  • Anti-inflammatory, calming redness in rosacea

Benefits

Acne

strong evidence

Randomized trials show 15–20% azelaic acid reduces inflammatory and non-inflammatory acne lesions comparably to benzoyl peroxide or topical antibiotics — without bacterial resistance.

Rosacea

strong evidence

Azelaic acid is FDA-approved for papulopustular rosacea and reduces both bumps and redness; it is a dermatologist staple for rosacea-prone skin.

Hyperpigmentation and melasma

strong evidence

By blocking tyrosinase, azelaic acid lightens dark spots and melasma, with efficacy comparable to low-strength hydroquinone in some studies — without hydroquinone's safety baggage.

Post-acne marks

moderate evidence

Because it treats both the breakout and the pigment it leaves behind, azelaic acid is a favorite for people whose acne heals into dark spots.

Side effects & safety

Itching, stinging, or redness in the first weeks (common)Usually mild and fades after 2–4 weeks; starting every other day and applying over moisturizer helps.
Dryness or peeling (uncommon)Pair with a ceramide moisturizer; avoid stacking with strong exfoliants initially.

Safety considerations

  • Azelaic acid is one of the few acne treatments widely considered safe during pregnancy and breastfeeding — it is the standard pregnancy acne recommendation alongside topical benzoyl peroxide.
  • Combines well with retinoids and niacinamide; introduce one at a time if your skin is sensitive.
  • Using with strong AHAs/BHAs in the same routine increases irritation.
  • Not for: Known allergy (rare)

How it's used

In skincare

OTC products use 10%; prescriptions use 15% gel or 20% cream. Apply a thin layer once or twice daily after cleansing, before moisturizer. Expect visible results at 4–8 weeks; full effects at 12 weeks.

Regulatory status

  • Prescription strengths (15–20%) are FDA-approved drugs for acne and rosacea; 10% formulations are cosmetic. The 10% OTC path is a recent development following FDA rulemaking.
  • INCI name on cosmetic labels: Azelaic Acid.
  • The CIR Expert Panel has assessed azelaic acid as safe in cosmetics.

Popular products containing Azelaic Acid

  • Azelaic Acid Suspension 10% — Silicone-suspended creamThe Ordinary · Skincare
  • Azelaic Acid Booster 10%Paula's Choice · Skincare
  • Finacea 15% Gel — PrescriptionLEO Pharma · Skincare

Product names and brands are shown for reference and belong to their respective owners.

Azelaic acid vs salicylic acid vs benzoyl peroxide

All three fight acne differently. Salicylic acid (BHA) dissolves debris inside pores — best for blackheads. Benzoyl peroxide kills bacteria with the strongest punch but bleaches fabric and can irritate. Azelaic acid splits the difference: antibacterial, pore-clearing, and anti-inflammatory, with the bonus of fading dark marks — the best choice when acne and pigmentation coexist, and the pregnancy-safe pick.

Frequently asked questions

Can I use azelaic acid with retinol?

Yes — this is a well-established combination. Many routines use azelaic acid in the morning and retinol at night, or layer them in the evening. Introduce both slowly, since each can cause initial irritation.

How long does azelaic acid take to fade dark spots?

Most trials measure meaningful lightening at 8–12 weeks of twice-daily use. Post-acne marks often respond faster than long-standing melasma; sunscreen is non-negotiable throughout.

Does azelaic acid purge?

A brief worsening is possible as pores clear, but azelaic acid's low irritation profile makes true purging less common than with retinoids. Persistent worsening beyond 4 weeks is more likely irritation — reduce frequency.

The bottom line

Azelaic acid is the versatile, pregnancy-safe multitasker for skin dealing with breakouts, redness, and dark spots simultaneously. Start at 10%, be patient for 8–12 weeks, and pair it with sunscreen and a barrier moisturizer.

References

  1. Azelaic acid compound summary. PubChem (National Library of Medicine). https://pubchem.ncbi.nlm.nih.gov/compound/2266
  2. Azelaic acid in acne — literature search. PubMed (National Library of Medicine). https://pubmed.ncbi.nlm.nih.gov/?term=azelaic+acid+acne+randomized
  3. Azelaic acid for rosacea and melasma — literature search. PubMed (National Library of Medicine). https://pubmed.ncbi.nlm.nih.gov/?term=azelaic+acid+rosacea+melasma
  4. Azelaic acid prescribing information (Finacea). U.S. Food and Drug Administration. https://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&ApplNo=021470