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Azelaic acid

Azelaic acid in skincare: Anti-inflammatory, comedolytic, tyrosinase inhibitor. What it does on skin, how strong the evidence behind the claim actually is, the concentrations in normal use, who reacts to it, and where it stands in pregnancy and sunlight. On a label it appears as Azelaic Acid.

Exfoliating acidsAnti-inflammatory, comedolytic, tyrosinase inhibitorEvidence: Strong

On the label: Azelaic Acid. Also called: Nonanedioic acid.

This is an ingredient reference, not a diagnosis and not a treatment plan. It describes what substances are and what the published evidence supports; it does not tell you what your skin has or what to put on it. A rash that spreads, hurts, weeps, does not settle, or comes with feeling unwell is a reason to see a doctor or pharmacist, not to change serum.

What it is

A dicarboxylic acid found naturally in wheat, rye and barley and produced industrially for use. It sits on the boundary between cosmetic and medicine: at 15% and 20% it is a licensed prescription treatment for rosacea and acne in many countries, while cosmetic products typically use around 10%. Same molecule, different regulatory status, and quite different expectations.

What it does on skin

It does four useful things at once, which is unusual. It normalises the way cells shed inside the follicle, so plugs form less readily. It suppresses the bacteria involved in inflamed acne. It calms inflammation, which is why it helps the papules and pustules of rosacea. And it inhibits the enzyme that starts pigment production, so the brown marks left behind by old spots fade faster than they otherwise would.

What the evidence is worth

Evidence: Strong

The prescription strengths are properly supported for rosacea and for acne, with the pigment benefit well described as a bonus rather than a headline. The evidence for a 10% cosmetic version is an extrapolation downward: plausible, gentler, slower, and not the strength that was studied. Anyone reading trial results for 15% gel and buying a 10% cream should expect less.

How it is used

Applied thinly to the whole affected area rather than dabbed on individual spots, once or twice daily, and judged after two to three months rather than two weeks. The texture is grainy and it can pill under sunscreen, so let it settle. It is one of the few actives that suits both inflamed acne and post-inflammatory pigmentation without a separate product for each.

Typical concentration in normal use: 10% cosmetic, 15-20% medicine. That is a description of the market, not a recommendation, and it is not a dose.

Who reacts to it

Transient stinging, tingling and mild burning in the first weeks are described by a substantial minority of users, and usually fade. Unlike hydroquinone it does not lighten normal surrounding skin, so it will not leave pale patches.

Pregnancy and breastfeeding

Generally considered fine

Azelaic acid is one of the treatments most often kept when other acne actives are stopped in pregnancy. Because the effective strengths are medicines, the decision belongs with your doctor or midwife, who will also weigh what else you are using.

Sunlight

No change

It does not make skin more sensitive to sunlight. If you are using it for pigmentation, though, sun exposure is the thing driving the pigment, so sunscreen is what makes the treatment work rather than a precaution against it.

Rules and labelling

Permitted in cosmetics, but the 15% and 20% products are authorised medicines in most European countries and are supplied through a pharmacy. A cream sold online at 20% without that authorisation is not a stronger cosmetic, it is an unlicensed medicine.

What it goes with, and what it does not

It sits well with niacinamide and with a gentle cleanser, and it is the usual choice when a retinoid is too irritating or is off the table. Combining it with an exfoliating acid rarely adds anything except stinging.

One thing people get wrong

The myth is that it is a mild botanical because it occurs in grain. It occurs in grain the way sugar occurs in fruit — the version in your tube was made in a factory, and at treatment strength it is a regulated medicine with a real side-effect profile. Being naturally occurring says nothing about how strong or how gentle a substance is.

Sources: EU Cosmetics Regulation (EC) No 1223/2009 and its annexes, as published in the European Commission's CosIng database, for every statement about what is permitted, restricted or banned · opinions of the Scientific Committee on Consumer Safety (SCCS) and safety assessments of the Cosmetic Ingredient Review (CIR) for the concentration positions · standard dermatology reference material for mechanism, tolerability and contact-allergy patterns · checked 2026-09-06. Deep links are deliberately omitted where a stable public URL could not be confirmed.

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