The pimple has disappeared, but a mark remains visible for several weeks. Depending on your skin and the intensity of the inflammation, this mark may be red, pink, purplish, brown, or grayish. However, not all post-acne marks are caused by the same phenomenon and do not require exactly the same care.
Should you choose azelaic acid, tranexamic acid, or simply be patient? Here is how to distinguish the main marks left by pimples and build a targeted Korean routine without unnecessarily multiplying active ingredients.
A post-acne mark is not always a scar
The word "scar" is often used to refer to any mark left by a pimple. In dermatology, however, a true scar involves a change in the texture of the skin: it can be pitted or, conversely, raised.
A red or brown mark that remains perfectly flat more often corresponds to a temporary change in skin color. It may gradually fade, even if this process sometimes takes several months.
If the skin is pitted, thickened, or permanently raised, cosmetics will not be able to fully correct this structural change. A dermatologist can then guide you toward more suitable solutions.
Red marks: post-inflammatory erythema
After an inflammatory pimple, the area may remain red, pink, or sometimes purplish. This mark is often called post-inflammatory erythema, or PIE. It is linked to the persistence of vascular changes after inflammation.
It is frequently noticeable on light complexions, but color alone does not always allow for a diagnosis. On some skin types, a mark may combine redness and pigmentation.
To care for these marks, the priority is to avoid new irritation. A gentle routine, good hydration, and an active ingredient like azelaic acid can be introduced gradually.
Brown spots: post-inflammatory hyperpigmentation
When inflammation stimulates an excessive production of melanin, it can leave a brown, grayish, or darker-than-natural spot. This is known as post-inflammatory hyperpigmentation, or PIH.
This phenomenon can affect all complexions, but it is often more visible and more persistent on medium to dark skin. The spots may fade over time, provided that new inflammation is limited and the skin is protected from the sun.
Ingredients such as azelaic acid, niacinamide, tranexamic acid, or alpha-arbutin can find their place in a routine aimed at evening out the complexion.
Yoonah's advice
First, look at the color and texture of the mark. A flat, red, or pink mark mainly requires gentleness and time. A flat and darker mark can be targeted with a dark spot treatment. A pitted or raised mark generally requires a different dermatological approach.
Three Korean skincare products to discover at Yoonah
1. Anua Azelaic Acid 10 Hyaluron Redness Soothing Serum: for redness and imperfections
The Anua Azelaic Acid 10 Hyaluron Redness Soothing Serum contains 10% azelaic acid. Its formula also combines panthenol, allantoin, hyaluronic acid, centella asiatica derivatives, niacinamide, and ceramide NP.
Azelaic acid is particularly interesting when pimples, redness, and post-inflammatory marks coexist. Introduce the serum gradually, for example two to three times a week, before adjusting the frequency according to your skin's tolerance.
Our opinion on the texture: its silky texture remains light and spreads easily. It is well suited to a multi-step routine, but a small amount is enough to avoid overloading the skin.
For which skin types? We recommend it especially for combination to oily skin, sensitive skin, or skin prone to red pimples and post-acne marks. Very reactive skin may experience tingling with azelaic acid: start slowly and space out applications in case of discomfort.
2. Anua Niacinamide 10% + TXA 4% Serum: for darker spots
The Anua Niacinamide 10% + TXA 4% Serum combines 10% niacinamide, 4% tranexamic acid, and arbutin. This combination targets brown spots and uneven complexion. The formula also contains several forms of hyaluronic acid and plant oils.
This serum is more focused on pigment marks than on fresh redness. Apply it to the entire face or only to the affected areas, then finish with a moisturizer.
Our opinion on the texture: its texture is light and slightly silky, without being as watery as a toner. It integrates easily under a cream and can leave a luminous finish.
For which skin types? It may suit normal, combination, or oily skin with brown spots and an uneven complexion. With 10% niacinamide, it may be too intense for some sensitive skin: in this case, use it less often and avoid layering it immediately with several new active ingredients.
3. Beauty of Joseon Relief Sun Aqua-Fresh SPF50+ PA++++: to protect your progress
The Beauty of Joseon Relief Sun Aqua-Fresh SPF50+ PA++++ combines high sun protection with rice water and panthenol. It is used every morning as the last step in the routine, in a sufficient quantity on the face and neck.
Sun protection does not make a mark disappear instantly, but it helps prevent UV exposure from maintaining pigment irregularities. It therefore remains essential in a routine dedicated to post-acne marks.
Our opinion on the texture: it has a fluid, light, and less creamy texture than the original Relief Sun. Its fresh and non-greasy finish is pleasant for daily use and layers easily over serums.
For which skin types? It is particularly suited for normal, combination to oily, or dehydrated skin looking for light protection. Very dry skin may apply a moisturizer underneath.
Should you use both serums at the same time?
It is not mandatory. If your main concern is the presence of red pimples accompanied by pink marks, start with the azelaic acid serum. If acne is under control but brown spots persist, the tranexamic acid and niacinamide serum will be more targeted.
When both types of marks coexist, you can alternate the serums: for example, azelaic acid one evening and the TXA serum the next evening. This method makes it easier to monitor your skin's tolerance. After several weeks, skin accustomed to active ingredients may eventually use one product in the morning and the other in the evening, provided it experiences neither irritation nor dryness.
Example of a routine against post-acne marks
In the morning
- Gentle cleansing or simple rinsing depending on your skin.
- Anua Niacinamide 10% + TXA 4% Serum if you are mainly targeting brown spots.
- Moisturizer if necessary.
- Beauty of Joseon Relief Sun Aqua-Fresh SPF50+ PA++++.
In the evening
- Makeup removal and appropriate cleansing.
- Anua Azelaic Acid 10 Serum for pimples, redness, and post-inflammatory marks.
- Moisturizer.
This organization is just an example. If your skin is sensitive, use only one serum for several weeks before considering the second.
Mistakes that slow down the improvement of marks
Popping or scratching pimples
Handling an imperfection increases inflammation and can heighten the risk of a persistent mark. A hydrocolloid patch can help you avoid touching the area.
Treating only the spot without controlling acne
If new pimples continually appear, new marks will form. A consistent strategy must therefore also address the cause of imperfections, with a suitable routine or dermatological guidance.
Introducing several active ingredients at once
Azelaic acid, exfoliants, retinoids, and concentrated serums do not necessarily need to be used during the same evening. Start gradually to avoid irritation, which can itself maintain spots.
Expecting results in a few days
Post-acne marks evolve slowly. Consistency, tolerance, and sun protection matter more than the accumulation of powerful products.
How long does it take to see a difference?
Some light marks fade naturally in a few weeks, while deeper spots may remain visible for several months. The speed of improvement depends on the complexion, the depth of the pigmentation, sun exposure, and the possible appearance of new pimples.
Photographing your skin once a month, in similar lighting, allows you to monitor its evolution more objectively. Daily observation in the mirror can give the impression that nothing is changing.
In summary
A red or pink mark often corresponds to post-inflammatory erythema, while a brown or grayish spot more likely suggests post-inflammatory hyperpigmentation. A true scar changes the texture of the skin and is not treated like a simple spot.
Azelaic acid is an interesting option when redness and imperfections coexist. The combination of niacinamide, tranexamic acid, and arbutin targets pigment marks more directly. In both cases, daily sun protection and a gentle routine remain essential to preserve results.