What post-acne marks are
After a spot heals, it often leaves a flat mark behind. When that mark is brown, grey or darker than the surrounding skin, it is called post-inflammatory hyperpigmentation, or PIH. Some marks are pink or red instead, reflecting lingering redness from small blood vessels. Either way, the skin surface is usually smooth — which is the key difference from acne scars , where the texture itself has changed.
PIH is very common, particularly in people whose skin tans easily or who have medium to deeper skin tones. It can fade on its own, but this often takes months, and new breakouts keep adding fresh marks to the picture.
Why it happens — and which layers are involved
In our 8-layer Skin Architecture model, PIH sits mainly in the epidermis . Inflammation from a breakout signals pigment cells to produce extra melanin, which stays behind once the spot has gone. When inflammation was deeper, some pigment can sit in the upper dermis as well, and these marks usually take longer to fade. Squeezing or picking spots, harsh treatments and sun exposure all increase inflammation and tend to make marks darker and longer-lasting.
Red marks are different: they come from dilated vessels in the upper dermis rather than pigment, so they respond to different settings and treatments.
How Obliv approaches post-acne marks
- Control the breakouts first. A doctor examines your skin before anything else. If acne is still active, calming it comes first — otherwise new marks keep forming. See our acne treatment page.
- Diagnose the marks. Mark-Vu imaging helps distinguish pigment marks from redness and from early texture change, which determines the right approach.
- Repair the barrier. Skin that has been through acne and drying treatments is often sensitised. We reinforce the barrier with ceramides and hyaluronic acid before treatment and protect it afterwards.
- Gentle, repeated treatment. For brown marks, low-energy Nobleen laser toning or pico toning helps fade pigment gradually without provoking new inflammation. Where marks are red, or red and brown together, BRIGHTONE can address pigment and vessels.
- Support recovery. Mirajet or skin boosters can help hydration and regeneration in sensitive, post-acne skin.
What to expect
PIH responds best to patience and consistency. Because the skin renews roughly every 28 days, sessions are spaced to work with that cycle, and marks typically lighten gradually over a course. Toning usually involves minimal downtime, often just mild redness that settles within hours. If some marks turn out to have texture change, your doctor may discuss scar treatments such as Potenza as a separate step. Results vary from person to person.
Caring for your skin between visits
- Avoid squeezing or picking spots — it is one of the biggest causes of darker marks.
- Use SPF50+ daily; UV makes PIH darker and slower to fade.
- Choose gentle, non-stripping cleansers and avoid scrubs.
- Follow the pH-5.5-matched home care we prescribe, rather than layering many active products.
Visiting from abroad
A consultation and first session can fit into a short stay, and we can suggest a plan to continue at home. Send clear daylight photos and your travel dates on WhatsApp, and ask us on WhatsApp for a personalised quote.
Marks or scars? Why the difference changes the plan
It is common to hear all post-acne changes described as scars, but the distinction matters because the treatments are different.
- Flat brown or grey marks are pigment. They are usually treated gently with toning, sun protection and barrier care.
- Flat pink or red marks come from small vessels and tend to respond to treatments that target redness.
- Dips, pits or raised areas are changes in texture, which means the dermis has been affected. These belong to scar treatment, such as the Acne Scar Program .
Many people have a mix of all three. A simple test is to shine a light across the skin from the side: if the mark casts a shadow, there is likely texture change. Your doctor will confirm this at consultation and order the steps so that pigment and redness are calmed before any deeper resurfacing. For an overview of the full journey, see our post-acne recovery goal.
At a glance
- Skin layer: Epidermis, sometimes upper dermis
- Main tools: Nobleen toning, pico toning, BRIGHTONE
- First step: Calm active acne and repair the barrier
- Sessions: A course, spaced with the 28-day cycle
- Downtime: Usually minimal
- Must-have: Daily SPF50+, no picking
Questions about post-acne marks
Are post-acne marks the same as acne scars?
No. PIH marks are flat colour changes, while scars involve a change in texture, such as dents or pits. The two often appear together, and a doctor will check which you have before planning treatment.
Will the marks fade on their own?
Many do, but it can take months, and sun exposure or new breakouts can slow this down. Treatment and good aftercare can help them fade more steadily.
Can you treat marks while I still have breakouts?
Usually we focus on calming active acne first, because new inflammation creates new marks. Your doctor may combine both steps where appropriate.
Is toning safe for darker skin tones?
Low-energy toning is often chosen precisely because it is gentle. Your doctor will adjust the approach and settings to your skin after examining it.
Talk to us about post-acne marks
Message us on WhatsApp in English. Obliv Clinic Seoul Origin, Pagoda Tower, 93 Cheonggyecheon-ro, Jongno-gu — about 5 minutes on foot from Jonggak and Euljiro 1-ga stations, close to Myeongdong.
This page is general information, not medical advice. Suitability, number of sessions and results vary from person to person and are decided with a doctor at consultation.
