Azelaic acid is a gentle, multi-purpose acne treatment that’s especially worth asking about if you have sensitive skin, dark marks left by old pimples, or a reason to avoid retinoids. It reduces acne bacteria, helps keep pores from clogging and calms redness. It also slows pigment production, which is why dermatologists often use it for post-acne dark spots. In the U.S., the proven strengths (15% gel or foam and 20% cream) need a prescription. Lower-strength versions sold without one are cosmetics and haven’t been studied the same way.
The American Academy of Dermatology’s 2024 acne guideline gives azelaic acid a conditional recommendation based on moderate-certainty evidence. It notes that azelaic acid may be particularly helpful for people with sensitive skin or darker skin types because of its lightening effect on dark marks.
What azelaic acid is and how it works
Azelaic acid is a naturally occurring acid found in grains such as wheat, rye and barley, and made by a yeast that normally lives on the skin. As a medicine, it works on several acne processes at once:
- Antibacterial: it reduces Cutibacterium acnes, the bacteria involved in inflamed pimples. It isn’t an antibiotic, so the antibiotic-resistance concerns that come with clindamycin or doxycycline don’t apply in the same way.
- Pore-clearing: it helps normalize how skin cells shed inside the follicle, which reduces blackheads and whiteheads (comedones).
- Anti-inflammatory: it can calm red, inflamed spots.
- Pigment-reducing: it inhibits tyrosinase, an enzyme involved in making melanin, which is why it can help fade post-inflammatory hyperpigmentation (the flat dark marks left after pimples heal). It’s for flat discoloration, not indented scars, which need different treatment; see our guide to acne scar types and treatments.
That combination is unusual. Few single ingredients address inflamed acne, clogged pores and dark marks at the same time.
What the evidence shows
- Guideline status: the 2024 AAD guideline recommends azelaic acid conditionally, with moderate-certainty evidence. By comparison, benzoyl peroxide and topical retinoids get strong recommendations. In practice, that means azelaic acid is a reasonable option, especially in particular situations, rather than the default first choice for everyone.
- Systematic review: a 2020 Cochrane review of azelaic acid, salicylic acid and other non-antibiotic topicals compared azelaic acid with placebo and with treatments such as benzoyl peroxide, tretinoin and clindamycin. It found the overall evidence for these treatments was limited, with few large, high-quality trials.
- Approval: azelaic acid 20% cream (brand name Azelex) is FDA-approved to treat mild to moderate inflammatory acne. The 15% gel and foam (Finacea and generics) are approved for rosacea, and clinicians sometimes prescribe them for acne as well.
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Who azelaic acid may suit
Azelaic acid is worth discussing with a clinician if you:
- Have dark marks after pimples, especially in medium or darker skin tones. The AAD’s guidance for acne in darker skin highlights treating acne early and preventing dark spots.
- Have sensitive skin that doesn’t tolerate retinoids or benzoyl peroxide well.
- Are pregnant, trying to conceive or breastfeeding and want to avoid retinoids. Only a small amount of topically applied azelaic acid is absorbed into the body, and it’s one of the options clinicians may consider. Always check with your obstetrician or dermatologist.
- Have acne plus redness-prone skin, since azelaic acid is also used for rosacea. Rosacea and acne can look alike, so get a diagnosis if you’re unsure.
It’s less likely to be enough on its own if you have moderate to severe inflamed acne, deep nodules or cysts, or scarring. Those need a dermatologist and usually stronger or combined treatment.
Prescription vs over-the-counter azelaic acid
| Product type | Strength | Status | Approved or marketed use |
|---|---|---|---|
| Azelex cream | 20% | Prescription | Mild to moderate inflammatory acne |
| Finacea gel and foam; generic gel | 15% | Prescription | Rosacea (sometimes prescribed for acne) |
| Custom compounded creams (some online services) | Varies | Prescription | Prescriber decides |
| Cosmetic serums and creams | Often about 10% or lower | Cosmetic (no prescription) | Marketed for texture, tone or redness; cannot claim to treat acne |
What about 10% azelaic acid you can buy without a prescription?
You’ll find many lower-strength azelaic acid serums and creams online and in stores. Because azelaic acid isn’t part of the FDA’s over-the-counter acne monograph, these are sold as cosmetics. That has a few consequences:
- They can’t legally be marketed to treat acne, so labels talk about “texture,” “tone” or “redness” instead.
- The clinical trials behind azelaic acid used prescription strengths (15% and 20%) in tested formulations. A 10% cosmetic isn’t the same product, and there’s much less evidence for it in acne.
- Strength and quality aren’t reviewed the way drug products are.
That’s why we don’t recommend a specific cosmetic azelaic acid product as an acne treatment. If you want an evidence-backed, over-the-counter option for mild acne, start with benzoyl peroxide or adapalene 0.1%. Our guides to benzoyl peroxide face washes and adapalene gel explain how to use them.
How to use prescription azelaic acid
Always follow your prescriber’s directions and the product label. For the 20% cream, the prescribing information directs:
- Wash the skin gently with a mild cleanser and pat it completely dry.
- Massage a thin layer gently into the affected areas.
- Use it twice a day, in the morning and evening, unless your prescriber says otherwise.
- Wash your hands afterward, and keep it away from your eyes, mouth and the inside of your nose.
Practical tips:
- Start slowly if you have sensitive skin. Many clinicians suggest once a day for the first week or two, then twice a day.
- Moisturize with a plain, fragrance-free product. See our guide to moisturizers for acne-prone skin.
- Wear sunscreen daily, especially if you’re treating dark marks. Our sunscreen guide for acne-prone skin has lightweight options.
- Be patient. The AAD says acne treatment in general takes about 4 to 6 weeks to show some improvement and two to three months or longer for clearer skin. Dark marks often take longer to fade.
Combining azelaic acid with other treatments
- With a retinoid: a common pairing, for example azelaic acid in the morning and adapalene or tretinoin at night. Start one at a time to limit irritation. Our Differin vs tretinoin guide explains the retinoid options.
- With benzoyl peroxide: can be used in the same routine, for example a benzoyl peroxide wash in the morning.
- With exfoliating acids: go easy. Stacking azelaic acid with strong leave-on acids adds irritation.
Check your full routine with our free ingredient conflict checker, which flags combinations that commonly irritate. We also answer two common pairing questions in detail: azelaic acid with niacinamide and azelaic acid with retinol.
Side effects and cautions
According to the prescribing information and clinical experience:
- Common: itching, burning, stinging and tingling, usually mild and most noticeable in the first few weeks. Dryness and redness can also occur.
- Lightening of normal skin (hypopigmentation): isolated cases have been reported. The label advises that people with darker skin be watched for early signs of pale patches. Tell your clinician if you notice any.
- Allergic reactions: stop and seek care if you get swelling, hives or a severe rash.
- Eyes: it can irritate the eyes. Rinse with plenty of water if it gets in.
Try a new product on a small patch of skin first if you tend to react to skin care. The AAD describes a simple way to test products at home.
How to get prescription azelaic acid
You can get a prescription from a dermatologist, your primary care clinician, or, for adults, some online acne services. Several online services include azelaic acid as one ingredient in a custom compounded cream.
If you’re an adult without any of those exceptions, our comparison of online acne treatment services explains which services offer azelaic acid and what they charge. Not sure which route fits? Our free acne treatment quiz suggests a next step, and nothing you enter leaves your browser.
When to see a dermatologist in person
See a dermatologist in person if you have painful nodules or cysts, acne that’s scarring, dark marks that aren’t fading after several months of treatment and sun protection, possible rosacea, or if you’re pregnant and need a treatment plan. Early treatment of inflamed acne is the best way to prevent new dark marks and scars.