Azelaic Acid
Pregnancy-safe acne and rosacea active. FDA Pregnancy Category B — the strongest evidence base among topical acne treatments.
Quick answer
Azelaic acid is FDA Pregnancy Category B — the strongest evidence base among topical acne and brightening actives. Effective for acne, rosacea, and post-inflammatory hyperpigmentation. Widely recommended as the first-line pregnancy acne treatment.
INCI name
Azelaic Acid
CAS number
123-99-9
Also known as
Nonanedioic acid, 1,7-heptanedicarboxylic acid
Formula
C9H16O4
What is Azelaic Acid?
What azelaic acid is
Azelaic acid is a naturally-occurring saturated dicarboxylic acid found in wheat, rye, and barley, and produced by Malassezia furfur (a yeast naturally present on human skin). For topical pharmaceutical use it’s synthesized commercially. Available OTC at low concentrations and by prescription at 15% (Finacea) and 20% (Azelex)1.
Mechanism of action includes antibacterial effects (against P. acnes), tyrosinase inhibition (lightening hyperpigmentation), and anti-inflammatory effects.
Why azelaic acid is the pregnancy-safe acne first-choice
Several factors make azelaic acid uniquely well-positioned for pregnancy:
- FDA Pregnancy Category B. The highest pregnancy safety category for an effective topical acne active. No evidence of risk in animal studies, supported by human data2.
- Natural metabolite. Azelaic acid is normally present in the body as a metabolite of long-chain fatty acids. Topical exposure doesn’t introduce a foreign molecule.
- Minimal systemic absorption. Less than 4% absorbed dermally; serum concentrations remain below endogenous baseline levels after typical application3.
- Multi-symptom benefit. Effective for active acne and the post-inflammatory hyperpigmentation that often follows it. Useful for pregnancy-induced melasma. Approved for rosacea.
- No photosensitivity. Unlike retinoids or AHAs, azelaic acid doesn’t increase sun sensitivity. Safe for morning use.
ACOG, the American Academy of Dermatology, and most OB-GYN dermatology references list azelaic acid as the first-line topical for pregnancy acne4.
Practical use during pregnancy
Common application: thin layer once or twice daily on affected areas. Starts working within 4–6 weeks; full effect at 12+ weeks. Side effects (mild stinging, tingling) typically diminish after the first 1–2 weeks.
Compatible with:
- Mineral sunscreen — daytime use
- Niacinamide — complementary anti-inflammatory effects
- Hyaluronic acid — counters any drying
- Vitamin C — antioxidant brightening synergy
Not recommended to combine with retinoids (which should be discontinued in pregnancy anyway) or strong acids in the same routine.
Common products
The Ordinary Azelaic Acid 10% Suspension (OTC, lower concentration). Paula’s Choice Boost Azelaic Acid Booster. Finacea 15% Foam and Azelex 20% are prescription strengths if needed for more severe acne or rosacea in pregnancy.
When to talk to your OB
If you used a product containing Azelaic Acid before learning you were pregnant, mention it at your next prenatal visit — but most topical cosmetic exposures are not a cause for panic. For prescription exposures or specific concerns, contact your OB or midwife directly.
Sources
- U.S. National Library of Medicine. Azelaic acid. PubChem. View source →
- U.S. Food and Drug Administration. Finacea (azelaic acid) prescribing information. FDA / DailyMed. View source →
- Fitton A, Goa KL. (1991). Azelaic acid. A review of its pharmacological properties and therapeutic efficacy. Drugs. View source →
- Pugashetti R, Shinkai K. (2013). Treatment of acne vulgaris in pregnant patients. Dermatologic Therapy. View source →