Azelaic acid in cosmetics: for spots, redness, acne

Azelaic acid: when you should NOT use it

When you have a clearly irritated skin barrier

Azelaic acid is generally better tolerated than other acids, but that doesn't mean it's harmless for all skin types at all times. If your skin is burning, flaking, intensely red, or feels like it's burning when you apply almost any product, it's not the best time to introduce it. A compromised skin barrier can react even to active ingredients that, under normal conditions, it would tolerate perfectly.

This point is important because many people turn to azelaic acid after trying too many things. Harsh cleansers, frequent exfoliants, poorly introduced retinoids, drying masks, astringent toners, and long routines can leave the skin in a state of sustained irritation. In that context, adding azelaic acid may not solve the problem and, in fact, can increase itching or tightness.

When the barrier is compromised, the priority is not to treat the spot or pimple. The priority is to restore tolerance. This usually means simplifying the routine, using a gentle cleanser, a well-formulated restorative cream, and sunscreen. Once the skin is stable again, azelaic acid can be gradually introduced.

If you expect a fast depigmenting agent without sunscreen

You should not use azelaic acid expecting to improve dark spots if you don't use daily sunscreen. This is one of the most frequent and frustrating mistakes. Azelaic acid can help improve the appearance of dark spots, post-inflammatory marks, and uneven tone, but if the skin continues to receive UV radiation without adequate protection, the pigmentary stimulus continues.

For dark spots, melasma, or acne marks, sunscreen is non-negotiable. It's not enough to apply azelaic acid at night and forget about SPF in the morning. Ultraviolet radiation and visible light, especially in skin prone to hyperpigmentation, can maintain or worsen the problem. If you want to work on tone, the foundation is daily sun protection, reapplication when appropriate, and consistency.

Azelaic acid is a tool, not a license to skip photoprotection. If used in the morning, the last step should be a broad-spectrum sunscreen. If used at night, sunscreen is still essential the next day because pigmentation doesn't understand application times, but rather accumulated exposure.

When there is suspicion of allergy or intense reaction

Azelaic acid can cause stinging, itching, or a tingling sensation at first, especially on sensitive skin. In many cases, it's a mild and transient discomfort. But we shouldn't normalize every reaction. If intense redness, inflammation, hives, persistent itching, swelling, or clear worsening of the skin appears, it's advisable to stop the product and consult a professional.

It's also important to remember that azelaic acid as an isolated active ingredient doesn't always react. The skin may react to the complete formula: preservatives, fragrance, alcohols, emulsifiers, vehicle, pH, or combination with other products. Therefore, when a cosmetic "with azelaic acid" doesn't feel good, it doesn't automatically mean that you can never use azelaic acid. It may mean that specific formula is not for you.

For very reactive skin, a patch test is a good idea. Applying the product to a small area for several days before using it on the entire face can prevent surprises. It's not a perfect method, but it helps detect obvious incompatibilities before compromising the entire face.

If you are going to combine it with too many irritating active ingredients

Azelaic acid can coexist with many active ingredients, but it doesn't need an aggressive routine around it. If you combine it from day one with potent retinoids, acidic exfoliants, benzoyl peroxide, acidic vitamin C, and strong cleansers, it's very likely that your skin will complain. And when skin gets irritated, it not only feels worse: it can also worsen the appearance of redness, texture, and post-inflammatory spots.

The combination with retinoids is not prohibited, but it must be done sensibily. If your skin is already adapted to a retinoid and you want to add azelaic acid, it may be possible by separating application times, reducing frequency, or alternating nights. If you are starting with both at the same time, it is prudent not to do everything at once.

The same applies to exfoliants. Azelaic acid has a gentle keratolytic action, but it doesn't behave exactly like a classic glycolic or salicylic acid. Even so, if you add it to a frequent exfoliation routine, you can exceed the skin's tolerance. In dermo-cosmetics, more active ingredients do not always mean better results.

Can azelaic acid be used during pregnancy?

Why it is often considered an interesting option

Topical azelaic acid is considered one of the most commonly used options in a dermatological context during pregnancy, especially when seeking to treat mild to moderate acne, post-inflammatory marks, or a tendency to dark spots. Unlike retinoids, which are contraindicated during pregnancy, azelaic acid does not belong to that family and has a more favorable use profile in this context.

This does not mean you should self-medicate. Pregnancy and lactation are stages where any treatment, even topical, should be reviewed with professional judgment. The skin can also become more sensitive, more vascularized, or more prone to dark spots, so a formula you previously tolerated may be more uncomfortable. The active ingredient may be suitable, but the formula, concentration, and frequency matter.

The prudent recommendation is to consult, especially if we are talking about high-concentration products, skin with rosacea, dermatitis, significant inflammatory acne, or the simultaneous use of other treatments. Azelaic acid can be a reasonable alternative, but not every product with azelaic acid is automatically the best option for a pregnant woman.

Dark spots, melasma, and pregnancy

During pregnancy, there is often an increased tendency to hyperpigmentation. Melasma, also known as chloasma, can appear or worsen due to hormonal changes and sun exposure. In this context, azelaic acid may be of interest because it helps modulate processes related to pigmentation and can improve the appearance of uneven tone.

But the key again is sunscreen. In pregnancy, if there is a tendency to dark spots, daily photoprotection is the pillar. A depigmenting agent without a good sun protection strategy falls short. And we are not just talking about SPF applied symbolically in the morning. We are talking about adequate amount, reapplication if there is exposure, hat, shade, and common sense.

It is also advisable to avoid aggressive routines in search of quick results. Skin with melasma or a tendency to dark spots can worsen if irritated. Therefore, azelaic acid can be interesting precisely because it is not an aggressive exfoliant in the classic sense, but it must be formulated and used in a way that does not irritate.

Acne during pregnancy and lactation

Acne can appear or worsen during pregnancy due to hormonal changes, and many common options are not suitable at this stage. Azelaic acid can be useful because it combines antimicrobial, anti-inflammatory, mild comedolytic action, and support against post-inflammatory marks. For skin with pimples, redness, and residual spots, this combination makes a lot of sense.

Even so, not all acne is treated the same. Mild acne with blackheads does not require the same as inflammatory acne with painful nodules. If there are significant lesions, pain, scarring, or rapid worsening, it is correct to consult a dermatologist or a healthcare professional. Azelaic acid can be part of the approach, but it will not always be enough on its own.

During lactation, it is also advisable to individualize. Although the topical use of azelaic acid is usually considered compatible in many situations, applications in areas that may come into direct contact with the baby should be avoided and the complete formula should always be reviewed. Safety does not depend only on the star active ingredient, but on the entire product and how it is used.

Azelaic acid: at what percentage does it work?

Cosmetics versus dermatological use

Azelaic acid has an important particularity: it exists in both cosmetic products and dermatological products or topical medications, depending on the country, concentration, and indication. In cosmetics, more moderate concentrations are usually seen, typically around 5% to 10%. In dermatological use, concentrations of 15% or 20% are common, especially in acne and rosacea under professional judgment.

It is not advisable to think that a higher percentage is always better. 20% may have more clinical evidence in certain contexts, but it can also be more irritating for some skin types. A well-formulated 10% can be very interesting in cosmetics if the goal is to improve uneven tone, marks, texture, excess sebum, and redness with good tolerance. The final formula matters as much as the number on the package.

Furthermore, azelaic acid is not the easiest ingredient to formulate. It can result in gritty textures, a heavy feeling, or lack of cosmetic elegance if not well executed. Stability, particle size, vehicle, dispersion, sensoriality, and delivery system are crucial. A poorly formulated high concentration can be a worse experience than a well-designed moderate concentration.

What to expect from cosmetic concentrations

In cosmetics, a well-planned concentration can help gradually improve the appearance of the skin. Don't expect a change overnight. Azelaic acid works on several fronts: it helps regulate the appearance of sebum, improves texture, supports the management of post-inflammatory marks, and can soften the appearance of redness. But it needs weeks of consistent use.

Cosmetic concentrations usually seek balance. The idea is not to "destroy" the skin, but to provide efficacy with good tolerance. This is especially relevant for sensitive skin, skin with rosacea, skin prone to dark spots, or skin already using other active ingredients. If the formula is well tolerated, consistency will be much easier.

A cosmetic with azelaic acid can be useful even without reaching pharmacological concentrations, as long as we don't promise what is not appropriate. For deep dark spots, intense rosacea, or significant inflammatory acne, professional evaluation may be necessary. For mild imperfections, marks, uneven tone, and sebum, a well-constructed cosmetic formula can make a lot of sense.

Why the formula can change everything

Concentration cannot be interpreted alone. Two products with the same percentage of azelaic acid can behave very differently. Texture, pH, vehicle, emollients, soothing agents, the presence of niacinamide, panthenol, ceramides or humectants, and the delivery system can change tolerance and perceived efficacy.

Encapsulation can be an interesting tool when it helps improve stability, reduce the feeling of irritation, or modulate the availability of the active ingredient. It's not a magic word and it's not always necessary, but it can add value if it is well justified. The same applies to gradual release systems or dispersions that improve sensoriality.

For a premium brand, the challenge is not just to include azelaic acid. The challenge is for the product to be effective, stable, elegant, and tolerable. The skin does not reward a label full of active ingredients if the product later irritates, pills, feels gritty, or does not fit in with the rest of the routine.

Azelaic acid: what it is and where it comes from

What type of molecule it is

Azelaic acid is a dicarboxylic acid. This means that its chemical structure contains two carboxyl groups. Although it is referred to as "an acid" on social media, it does not behave exactly like alpha hydroxy acids, such as glycolic acid, nor like beta hydroxy acids, such as salicylic acid. Its profile is different, and precisely for this reason, it is so interesting for skin with several concerns at once.

Its activity is not limited to exfoliating. It has a gentle keratolytic action, but it is also studied for its effect on processes related to pigmentation, inflammation, the proliferation of certain bacteria involved in acne, and the regulation of keratinization. This is why it is used in contexts as diverse as acne, rosacea, melasma, post-inflammatory spots, and uneven texture.

It is an all-rounder active ingredient, but not magic. It can fit very well when there are dark spots and pimples, or when there is redness and texture, or when oily skin is imbalanced. But it does not replace sunscreen, it does not eliminate pitted scars, it does not treat all forms of acne, and it should not be used without judgment if the skin is very irritated.

Natural origin and cosmetic use

Azelaic acid exists naturally in some cereals, such as wheat, barley, or rye, and can also be related to biological processes in the skin. However, the azelaic acid used in cosmetics and dermatology is normally employed in a purified and controlled form, usually obtained by synthesis or industrial processes that ensure quality, stability, and concentration.

The fact that a molecule exists in nature does not mean that the cosmetic product is "natural". This distinction is important. In dermo-cosmetics, we are interested in knowing whether an ingredient is safe, stable, well-formulated, and useful for a specific purpose. The origin can be interesting, but it does not determine efficacy on its own.

In the case of azelaic acid, purity and formulation are particularly relevant. It is a molecule with a good track record in dermatology, but it can be difficult to integrate into elegant cosmetic textures. Therefore, when choosing a product, it is not enough to look at the percentage. The complete formula must be evaluated.

Why it has become so popular

Azelaic acid has become popular because it addresses very common problems. Dark spots, acne marks, redness, pimples, visible pores, uneven texture, and oily skin are very common concerns. In addition, many people are looking for better-tolerated alternatives to strong exfoliants or retinoids, especially if they have sensitive skin.

It has also gained interest because it fits into minimalist routines. A person who does not want to use too many active ingredients can find in azelaic acid an ingredient with several useful actions. But it is important not to fall into the extreme of thinking that it works for everything. It works for a lot, yes, but within limits and with a well-designed routine.

The trend in dermo-cosmetics is towards effective but tolerable formulas. It is not about irritating to believe that something works. It is about keeping the skin stable while working towards the goal. In that sense, azelaic acid has a very interesting place, especially when combined with good moisturizers, soothing agents, and sun protection.

What is azelaic acid used for on the skin?

Dark spots, post-inflammatory marks, and uneven tone

One of the most well-known uses of azelaic acid is to improve the appearance of dark spots and uneven tone. It has been studied for its ability to interfere with processes related to melanin production, especially in situations of hyperpigmentation. This makes it an interesting active ingredient for post-inflammatory spots, marks after pimples, and some melasma routines.

Post-inflammatory marks are very common. After a pimple, irritation, or injury, the skin can leave a brown, reddish, or purplish mark that takes a long time to disappear. Azelaic acid can help improve this appearance, but it requires consistency. And, again, without sun protection, the result will be much more limited.

With melasma, special caution is needed. Melasma is complex, chronic, and highly influenced by hormones, radiation, heat, and inflammation. Azelaic acid can be part of a strategy, but rapid disappearances should not be promised. In many cases, a personalized plan and professional monitoring are necessary.

Blemishes, Acne, and Excess Sebum

Azelaic acid is also useful for acne-prone skin. It has antimicrobial activity against microorganisms involved in acne, helps regulate keratinization, and can improve the appearance of inflammatory blemishes. Furthermore, since it also addresses residual marks, it is particularly interesting for people who not only have pimples but also subsequent spots.

For oily skin, its sebum-regulating action can help. It will not radically "shut down" sebum production, nor should it. Skin needs sebum. But it can contribute to the skin looking less unbalanced, with less excessive shine and a more uniform texture, especially if accompanied by a gentle cleansing routine and light hydration.

Not all types of acne are managed the same way. For mild or comedonal acne, it can be a good cosmetic or supportive option. For moderate or severe inflammatory acne, with nodules, pain, or scars, dermatological evaluation is needed. It's important not to delay medical treatment when the skin needs it.

Redness, Rosacea, and Reactive Skin

Azelaic acid is of interest for skin with redness because it exhibits anti-inflammatory activity and is used in the dermatological management of papulopustular rosacea. This differentiates it from many classic exfoliating acids, which can be too irritating for rosacea-prone skin if used carelessly.

However, rosacea-prone skin does not mean skin that tolerates any azelaic product. Rosacea is skin with special sensitivity. It can react to heat, alcohol, perfumes, sudden temperature changes, exfoliation, stress, or ingredients that would not cause problems on other skin types. Therefore, the formula must be very gentle.

In these cases, less is often more. A well-formulated azelaic acid, introduced gradually and accompanied by a calming routine, can be helpful. But if combined with too many active ingredients, if applied every day from the beginning, or if the formula is irritating, it can worsen burning or redness sensations.

How to Use Azelaic Acid in Your Routine

Application Step

Azelaic acid is usually applied after cleansing and before cream, especially if it's in serum, gel, or light treatment cream format. In a simple routine, the order would be gentle cleanser, azelaic acid, moisturizer, and sunscreen in the morning. If used at night, cleanser, azelaic acid, and cream.

If the product has a treatment cream texture, it can take the place of an intermediate step before the moisturizer or even replace it for oily skin if the formula already provides enough hydration. But for dry, sensitive skin or skin with a fragile barrier, it's usually advisable to add a repairing cream afterward.

Application should be thin and even. There's no need to apply a lot. Applying more product will not speed up spot fading or eliminate pimples faster. It can increase irritation, make the texture uncomfortable, or cause the product to accumulate in certain areas.

Frequency of Use When Starting

The smartest way to start is progressively. If you've never used azelaic acid, you can begin two or three nights a week and observe your skin's tolerance. If your skin responds well, you can increase the frequency. Some people tolerate it daily from the start, but there's no need to rush.

For sensitive skin, patience is part of the treatment. If a slight itch appears and quickly disappears, it can be normal. If intense burning, marked flaking, or worsening redness appears, it's advisable to reduce frequency or discontinue use. Skin doesn't have to suffer to improve.

You can also alternate it with other active ingredients. For example, use azelaic acid some nights and a retinoid on others, or reserve vitamin C for the morning and azelaic acid for the night. The key is not to introduce too many new things at once, because if your skin reacts, you won't know what caused it.

Morning Use and Sun Protection

Azelaic acid can be used in the morning, provided the formula is comfortable and you finish with sunscreen. It is not considered a photosensitizing ingredient in the same way as other active ingredients, but when dealing with spots, redness, or acne marks, photoprotection is essential.

If you use it during the day, consider tolerance and texture. Some azelaic acid formulas can pill or be more difficult to combine with makeup and SPF. If this happens, you can try using less, allowing more time between layers, or switching it to night use. The best routine is one that can be maintained without fighting with textures.

Sunscreen should be the last step in the morning. For skin with spots, it's advisable to choose a broad-spectrum SPF, and in many cases, a tinted sunscreen can be interesting for its help against visible light. This does not replace azelaic acid, but it accompanies it very logically.

What Active Ingredients to Combine It With

Azelaic acid combines particularly well with niacinamide. It's a very interesting pair for skin with redness, oiliness, visible pores, spots, and blemishes. Niacinamide can help strengthen the barrier, improve tolerance, and provide soothing and sebum-regulating support.

It can also be combined with hyaluronic acid, panthenol, and ceramides. These ingredients do not compete with it. On the contrary, they help keep the skin more hydrated and comfortable. When working with active ingredients that can sting or irritate, a good moisturizing and repairing base makes a difference.

With retinoids, acidic vitamin C, or exfoliants, individualization is advisable. It's not forbidden to combine them, but it's not always necessary to do so in the same routine. If the skin is resilient, it may tolerate it. If the skin is sensitive, it's better to alternate.

Azelaic Acid: What Most People Do Wrong

Using It Only When a Pimple Appears

Azelaic acid does not work as an overnight emergency product. It can help skin with blemishes, but its greatest benefit comes with consistency. If you only apply it when a pimple appears and then abandon it, you probably won't see its full potential on marks, texture, sebum, and uneven tone.

This doesn't mean it has to be used every day from the start. It means it should be incorporated as part of a strategy. Two or three times a week initially, increasing if well-tolerated, usually makes more sense than using it impulsively only when the skin is at its worst.

Spots and marks need time. Skin doesn't erase accumulated pigment in a few days. If there are post-inflammatory marks, azelaic acid can help, but it needs weeks and always accompanied by sun protection.

Combining It With a Too-Aggressive Routine

Another common mistake is adding it to an already irritating routine. Many people with acne or spots use very strong cleansers, exfoliants several days a week, retinoids, potent vitamin C, and purifying masks. Then they add azelaic acid, and their skin becomes inflamed. The problem is not always the azelaic acid. Sometimes it's the sum.

Irritation can worsen exactly what you want to improve. For skin prone to spots, inflammation can promote post-inflammatory hyperpigmentation. For rosacea-prone skin, it can increase redness and burning. For acne-prone skin, it can disrupt the barrier and make everything less tolerable.

An effective routine doesn't have to be aggressive. Gentle cleansing, treatment with a well-chosen active ingredient, moisturizing, and sun protection can be more effective than a routine full of steps that the skin cannot tolerate.

Choosing Solely By Percentage

Choosing azelaic acid solely by percentage is a poor strategy. A poorly formulated 10% can be harsh, uncomfortable, or irritating. A well-formulated moderate percentage can be much more pleasant and sustainable. And a 15% or 20% might be suitable in certain contexts, but not necessarily as an introductory cosmetic for all skin types.

Tolerance is part of efficacy. If a product is so uncomfortable that you abandon it after a week, it won't give you results. If a formula allows you to use it consistently for months, it will probably be more useful in real life.

Look at the complete formula. Soothing, hydrating, repairing ingredients and a well-designed texture can completely change the experience. Cosmetics are not just a list of percentages. It's formulation.

Not Adjusting Hydration

Many people start azelaic acid and don't adjust their hydration. Although it's relatively well-tolerated, it can cause dryness, itching, or tightness, especially at first. If you don't reinforce your cream or re-evaluate your cleanser, you might think the active ingredient isn't working for you when in reality your routine is incomplete.

An appropriate cream does not "cancel out" azelaic acid. On the contrary, it can help you tolerate it better. For oily skin, a light gel-cream might be enough. For sensitive or dry skin, a more repairing cream might be needed.

Sunscreen is also part of that adaptation. If you're treating spots or marks, SPF is not an extra. It's the step that prevents the problem from persisting. Without it, azelaic acid is fighting against a constant stimulus.

Azelaic Acid: What Results to Expect and How Soon

First Weeks: Tolerance, Texture, and Redness

In the first few weeks, the most important thing is to assess tolerance. You might notice a slight itch or tingling upon application, especially at first. If it's mild and quickly disappears, it can be acceptable. If it's intense, persistent, or accompanied by visible irritation, adjustments need to be made.

The first changes are usually related to texture and comfort. Skin may look a bit more uniform, less congested, or with less excessive shine. For redness, some people notice gradual improvement, but it's usually not immediate. Sensitive skin needs time and a consistent routine.

It's not advisable to evaluate spots in ten days. Post-inflammatory spots and marks take longer. If your main goal is tone, think in months, not a week. Consistency and daily SPF are much more important than applying more quantity.

8 to 12 Weeks: Tone, Marks, and Blemishes

Around 8-12 weeks is a more reasonable time to assess results for marks, uneven tone, and blemishes. Marks appear less intense, texture can be more uniform, and breakouts may be less frequent if the product suits the skin.

For acne, the result depends on severity. For mild to moderate blemishes, it can be an interesting aid. For more serious inflammatory acne, it might fall short if used as the sole treatment. If there's pain, scars, nodules, or worsening, it's not advisable to spend months trying cosmetics without professional evaluation.

For spots, the result also depends on the type of pigmentation. A recent post-pimple mark is not the same as melasma of several years. Azelaic acid can help, but the strategy must be adapted to the case.

Realistic Results, Without Exaggeration

Azelaic acid can greatly improve the appearance of some skin types, but it doesn't work miracles. It can help with spots, marks, redness, blemishes, and sebum. It does not eliminate pitted scars, it does not replace medical treatment when needed, and it does not correct complex melasma on its own.

Its great advantage is its versatility with relatively good tolerance. It's an all-rounder active ingredient, useful in many routines, especially when you want to treat several concerns without resorting to overly aggressive actives. But its effectiveness depends on concentration, formula, frequency, consistency, and sun protection.

The most honest way to see it is this: if your skin has post-inflammatory spots, redness, visible pores, oiliness, or mild pimples, azelaic acid can be a very interesting option. If you have an intense dermatological condition, you need to go beyond cosmetics and seek professional guidance.

Frequently Asked Questions about Azelaic Acid

Sources and References

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2. King S, Campbell J, Rowe R, Daly ML, Moncrieff G, Maybury C. "A systematic review to evaluate the efficacy of azelaic acid in the management of acne, rosacea, melasma and skin aging." Journal of Cosmetic Dermatology, 2023. [DOI 10.1111/jocd.15822]

3. Searle T, Ali FR, Al-Niaimi F. "The versatility of azelaic acid in dermatology." Journal of Dermatological Treatment, 2022. [DOI 10.1080/09546634.2021.1966075]

4. Ly S, Kamal K, Le F, et al. "Treatment of Acne Vulgaris During Pregnancy and Lactation: A Narrative Review." Dermatology and Therapy, 2022. [DOI 10.1007/s13555-022-00854-3]

5. Fitton A, Goa KL. "Azelaic acid. A review of its pharmacological properties and therapeutic efficacy in acne and hyperpigmentary skin disorders." Drugs, 1991. [DOI 10.2165/00003495-199141050-00006]