Guide skincare - Facial care

Anti-acne care - which effective active ingredients according to a doctor and analyses by BeautyDecoders.

Four families of documented active ingredients: salicylic acid to unclog pores, anti-bacterial and anti-spot azelaic acid, sebum-regulating niacinamide, and retinoids that act on all the causes of acne. The routine is simple, fragrance- and alcohol-free, with a gradual introduction of active ingredients.

ApproachIndependent cosmetic analysis

MethodVerdict Sensitivity - Dr David's rule

Selection6 active ingredients rated by BeautyDecoders

On video

Anti-acne care explained

Understanding

Visit mechanisms acne

Four factors contribute to acne: hyperproduction of sebum, hyperkeratinization, bacterial overgrowth, etc. Cutibacterium acnes and inflammation.

01

Hyperseborrhea

The initial phenomenon. Excessive sebum production makes the skin oily and dilates the pores; the sebum no longer evacuates and accumulates in the glands.

02

Hyperkeratinization

When exposed to UV light, the squalene in sebum oxidizes to squalene peroxide, promoting pore clogging. In acne sufferers, the proportion of squalene is increased by 120 %.

03

C. acnes & inflammation

Once the pores are clogged, the environment becomes favorable to Cutibacterium acnes, which causes inflammation of the follicle and the formation of acne.

Editorial reading

The increase in squalene in acne sufferers explains a reservation about squalane-containing products for acne. Start with a simple, fragrance-free routine, with a gradual introduction to monitor barrier tolerance. If the skin can no longer tolerate any product, it's best to stop everything, restore the barrier, then start again.

Assets 01

L'salicylic acid

A keratolytic that exfoliates dead cells and deep-cleans pores. For acne sufferers, it prevents the formation of blackheads: a preventive treatment. It differs from benzoyl peroxide, which kills bacteria already present.

⚠

The ratings and review excerpts come from users of the BeautyDecoded application. These reviews are not verified. The Sensitivity Verdict applies the Dr David Rule: a sensitive skin score below 0 indicates a potential risk of irritation; between -2 and -5, a product not suitable for sensitive skin.

BHA Scrub 2% - Paula's Choice

Paula's Choice 2% BHA Liquid Exfoliant

★★★★★4,74/5(31 reviews - solid base)

Salicylic reference - oily skin

Exfoliating lotion with 2 % salicylic acid (BHA) and green tea, to be applied without rinsing. Blemish score 85 and oily skin profile 91 - very suitable for acne-prone skin. Sensitive skin score -1.0 - slight caution, to be introduced every second or third evening. Several feedbacks remind us to avoid combining it with incompatible assets.

Scores BeautyDecoded

Dry skin

73,5

Oily skin

84

Normal to oily

91

Sensitive skin

-1

Imperfections

85

Stains

3,4

⚠ Sensitivity verdict Slight caution (score: -1.0). Introduce every second or third evening.

User feedback (31 reviews - representative extracts)

★★★★★«Best salicylic acid product, irritating only if routine contains incompatible products.»

★★★★★«BHA is my favorite for my oily skin, I use it after double cleansing.»

★★★★«I use it every third day in the evening, doesn't stick too much, one bottle lasts a long time.»

★★«Disaster for my sensitive skin, made my acne worse.»

Verdict - Reference in salicylic acid for oily skin with imperfections (85 / oily skin 91). Slight caution (-1.0), not to be combined with other exfoliants. 4.74/5 out of 31 reviews.

Assets 02

L'azelaic acid

An underestimated active ingredient: gentle exfoliant, anti-bacterial and anti-inflammatory, it also acts on post-acne hyperpigmentation. Highly effective on adult acne, it can also be used during pregnancy - a first-rate active ingredient.

Azelaic serum 10% - Anua

Anua Azelaic Acid 10% Hyaluron Redness Soothing Serum

★★★★★5,0/5(1 review - indicative rating)

Pregnancy-friendly - anti-redness

Serum with 10 % azelaic acid combined with hyaluronic acid, centella asiatica and allantoin, anti-bacterial and anti-inflammatory, suitable for use during pregnancy. Soothing profile: redness score 93,5, stains 76,5 and imperfections 88.4 - excellent on inflammatory acne and post-acne hyperpigmentation. Sensitive skin score +1.75 - adapted, A rare occurrence for an exfoliating active ingredient. Use gradually in the evening, as azelaic acid can be fluffy.

Scores BeautyDecoded

Dry skin

77

Oily skin

84

Normal to oily

91

Sensitive skin

+1,75

Imperfections

88,4

Stains

76,5

✓ Verdict sensitivity Suitable for sensitive skin (score: +1.75). Rare soothing profile for an exfoliant.

User feedback (1 review - no reliable summary)

Only one assessment is available to date: it is indicative and does not provide a representative summary.

★★★★★«I really like this serum: my skin is hydrated, more supple, and I have far fewer pimples.»

Verdict - Versatile, well-formulated azelaic acid (blemishes 88.4 / redness 93.5), effective on acne and marques post-acne, compatible with pregnancy. Favorable sensitive skin profile (+1.75). Indicative rating based on 1 single review.

Assets 03

Visit niacinamide

It strengthens the skin barrier by stimulating ceramide production, which improves tolerance to other active ingredients. It reduces sebum production, improves the appearance of pores and diminishes acne - a good complementary active ingredient, already present in many cleansers and creams.

Serum niacinamide 15% + zinc - COSRX

COSRX The Niacinamide 15 Serum

★★★★☆3,75/5(2 reviews - indicative basis)

High concentration - for tolerant skin only

Minimalist serum with a high dose of 15 % niacinamide, complemented by zinc PCA and acetyl glucosamine. Imperfections score 34 and stains 34, oily skin profile 91 - adapted for acne-prone skin. High concentration explains sensitive skin score -3.0 - not suitable for sensitive skin Dr. David's rule: reserve for tolerant skin, and introduce very gradually. Niacinamide is also found in lower doses in many better-tolerated moisturizers.

Scores BeautyDecoded

Dry skin

77

Oily skin

91

Normal to oily

91

Sensitive skin

-3

Imperfections

34

Stains

34

⚠ Sensitivity verdict Not suitable for sensitive skin (score: -3.0). High concentration, very gradual introduction reserved for tolerant skin.

User feedback (2 reviews - indicative basis)

★★★★«After 15 days, no more pimples and tightened pores; fast-absorbing texture, pleasant even in hot, humid climates.»

★★«Excellent results for several weeks, then my skin reacted (red patches, burning sensations): caution with such a high niacinamide content.»

Verdict - High-dose niacinamide (15 %) effective on sebum and pores (oily skin 91), but not suitable for sensitive skin (-3.0). For tolerant skin only. 3.75/5 out of 2 reviews (indicative basis).

Assets 04

Visit retinoids

A cornerstone of treatment: they accelerate cell renewal (and unclog pores), regulate sebum, reduce inflammation and help eliminate C. acnes. Retinol acts on all the causes of acne. Over-the-counter: start every second or third night, then increase. Sun protection essential.

Retinol serum - CeraVe

CeraVe Resurfacing Retinol Serum

★★★★☆4,40/5(10 reviews)

Post-acne marks - purging possible

Low-dose retinol serum, targeting marques acne and texture. Spot score 83.3 - effective on post-acne marques and imperfections 68. Sensitive skin score -1.15 - slight caution. Apply in the evening, starting every other night. Well tolerated according to several feedbacks, with a possible initial purging phenomenon.

Scores BeautyDecoded

Dry skin

87,5

Oily skin

78,4

Normal to oily

91

Sensitive skin

-1,15

Imperfections

68

Stains

83,3

⚠ Sensitivity verdict Slight caution (score: -1.15). Start every other evening.

User feedback (10 opinions - representative extracts)

★★★★★«Makes marques acne invisible while moisturizing skin, nice.»

★★★★★«Perfect for replacing more expensive retinals, no retinization, well tolerated.»

★★★★«More even complexion after three months, beware of small white spots at first (purging).»

★★★«I don't see any difference compared to other retinols tested.»

Verdict - Mild retinol effective on post-acne marques (83.3 spots), moisturizing. Slight caution (-1.15), initial purging possible. 4.40/5 out of 10 reviews.

Further information

Analyze an anti-acne product on your skin profile.

The BeautyDecoded application lets you scan any cosmetic product to visualize its suitability for your skin type and needs, based on INCI analysis.

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Application available on iOS and Android

The key stage

Visit cleaning acne-prone skin

Cleansing is a key step, but an overly aggressive cleanser often does more harm than good: it strips sebum, damages the skin barrier and triggers a rebound effect. Choose a gentle gel without alcohol or high pH, and double-cleanse in the evening if you're wearing make-up or sunscreen.

Oily skin cleansing gel - CeraVe

CeraVe Anti-Imperfection Foaming Gel

★★★★½4,50/5(33 reviews - solid base)

Oily skin - avoid on dry skin

Cleansing gel with niacinamide and salicylic acid, designed for oily skin with imperfections. Blemish Score 76,5 and oily skin 91 - suitable profile. Sensitive skin score -1.7 - slight caution, The product is not suitable for dry skin (25.9), where feedback indicates that there are patches. When cleansed twice, it does not dry out, according to several reviews.

Scores BeautyDecoded

Dry skin

25,9

Oily skin

91

Normal to oily

91

Sensitive skin

-1,7

Imperfections

76,5

Stains

34

⚠ Sensitivity verdict Slight caution (score: -1.7). Not suitable for dry skin.

User feedback (33 reviews - representative extracts)

★★★★★«Much fewer imperfections and marques, prevents the arrival of new pimples.»

★★★★★«Great for hormonal acne, on double cleansing it doesn't dry out the skin.»

★★★★«Does the job, rinses easily and economical.»

★★★«Not suitable for my dry skin, the active ingredients caused me to have patches.»

Verdict - Niacinamide + salicylic cleansing gel for oily to blemished skin (76.5 / oily skin 91). Slight caution (-1.7), avoid on dry skin. 4.50/5 out of 33 reviews.

Complete the routine

Hydration, LED, health practices

Hydration. Even oily skin needs moisturizing: not moisturizing weakens the barrier and makes the situation worse. Choose a light, non-comedogenic texture rich in humectants. See the guide how to moisturize your skin.

Additional information. LED phototherapy (blue light against C. acnes, anti-inflammatory orange light) can help. With regard to diet, the consensus is to reduce foods with a high glycemic index; milk can aggravate acne in some people (a one-month break and then reintroduction can be tested). Stress management tends to reduce severity. Zinc, oral or topical, brings real but modest benefit.

Sun. It seems to improve acne in the short term (anti-inflammatory effect), but exposure is not recommended: acne then rebounds (hyperkeratinization, squalene oxidation) and the risk of post-inflammatory hyperpigmentation is real.

⚗️

Benzoyl peroxide is keratolytic and anti-bacterial on C. acnes, with no resistance. Available in low concentrations without prescription, it should be used with care: leave on for no more than 30 seconds, then rinse thoroughly. Photosensitizing (sun protection mandatory), it can discolor clothing and bedding.

To be avoided

Visit errors not to commit

01

Lack of consistency

Without a regular daily routine, results are disappointing. Patience and regularity are the key.

02

Neglecting the environment

An unwashed pillow or sheets can ruin the efforts of even well-cleansed skin.

03

Alcohol & high pH

They strip away sebum, damaging the barrier and causing the skin to produce even more sebum, while no longer tolerating effective treatments.

04

Multiplying useless assets

Vitamin C or vitamin E are of no major benefit against acne, and add to the routine.

Frequently asked questions

Your questions about anti-acne care

Which active ingredient should you choose to start fighting acne?

Salicylic acid is a good place to start: easy to tolerate, it unclogs pores and prevents blackheads. Azelaic acid is an excellent alternative, even during pregnancy. Introduce one active ingredient at a time, gradually.

Is it necessary to moisturize acne-prone skin?

Yes, oily acne-prone skin needs moisturizing, with a light, non-comedogenic texture. Not moisturizing weakens the skin barrier and can increase sebum production, which worsens acne.

Is it possible to combine several anti-acne active ingredients?

Yes, but gradually and cautiously. Niacinamide combines well with most active ingredients. On the other hand, avoid using too many exfoliating or irritating active ingredients on the same evening, and stop using retinol a few days before and after a peel.

Does sun exposure improve acne?

Sunlight gives a deceptive short-term improvement, but then causes a rebound effect (hyperkeratinization, squalene oxidation) and a risk of post-inflammatory hyperpigmentation. It's best to avoid exposure and use appropriate sun protection.

Does diet affect acne?

The scientific consensus is that foods with a high glycemic index should be limited. Dairy products can aggravate acne in some people: stopping them for a month, then gradually reintroducing them, is a good way to test your case.

Further information

Our guides anti-acne detailed

Dr Sylvain DavidPlastic and aesthetic surgeon - Founder of BeautyDecoded

Information for educational purposes only. It does not replace a medical consultation and must be adapted to each individual. The compatibility scores generated by the application do not prejudge the individual tolerance of each skin type. In the event of pregnancy, skin pathology or doubt, dermatological advice is recommended. A tolerance test should be carried out before using the product for the first time.