Acne marks vs acne scars comes down to one question: has the skin changed colour, or has its surface changed? Marks are flat discolouration that usually fades, while scars alter the skin’s structure and do not fade on their own. This blog will walk you through how to tell which one you have, using a simple decision table.
How to tell acne marks from acne scars
A few simple checks, done in good light, sort most spots into marks or scars. The table below brings them together.
| Check | Brown mark (PIH) | Red mark (PIE) | Depressed scar | Raised scar |
| Run a fingertip across it | Smooth | Smooth | You feel a dip or pit | You feel a firm bump |
| Look at the colour | Brown, tan or grey | Pink, red or purplish | Often skin-coloured; may carry a mark on top | Pink, red or skin-coloured |
| Shine light from the side | No shadow | No shadow | Casts a shadow inside the dip | Casts a shadow beside the bump |
| Press a clear glass on it | Colour stays | Colour fades while pressed | Dip stays | Bump stays |
| Gently stretch the skin | No change | No change | Rolling scars soften; ice pick and boxcar scars keep their shape | No flattening |
| Over time | Fades slowly, sometimes over a year or more | Fades with time | Does not fade | Hypertrophic scars may flatten; keloids can grow |
The touch test
Wash and dry your face, then run a clean fingertip slowly across the spot. If the skin feels smooth even where you can see colour, it is a mark. If you feel an indentation, a ridge or a raised lump, there is scarring, even if the spot is also discoloured.
The side-lighting test
Stand beside a window or hold a phone torch at a low angle across your face. Texture casts a shadow; colour does not. A mark stays visible as colour whichever way the light falls, but it throws no shadow. A scar shows a shadow inside a dip or along the edge of a bump. Dermatologists examine acne scars in this kind of oblique light for the same reason.
The press test for red marks
Press the base of a clear drinking glass firmly against a red mark and look through it. If the redness fades while pressed and returns when you lift the glass, it is PIE, because pressure squeezes blood out of the widened vessels. A brown mark stays brown.
The stretch test for dents
Place two fingers either side of a dent and gently pull the skin apart. Rolling scars, which are held down by fibrous bands beneath the skin, often soften or flatten. Ice pick and deep boxcar scars keep their shape because the defect runs down into the skin rather than being pulled from below.
Why age alone does not tell you
It is tempting to assume that anything still visible after a year must be a scar. For brown marks, that rule fails. In a study by the Asian Acne Board of 324 acne patients across seven Asian countries, PIH lasted at least a year in more than half of patients and five years or longer in 22.3%. An old, flat, brown spot is still a mark, and it can still fade.
When a spot is both a mark and a scar
Marks and scars often sit together, sometimes in the same spot: a shallow dent can carry brown or red colour on top. A cohort of 40 patients cited in the Dermatological Society of Singapore’s acne guidelines, found that 58% of those with mild acne had red or brown post-acne marks. Among those with moderate acne, 54% had post-acne scarring and 14% had hypertrophic or keloid scars. Mixed spots and active breakouts are the point to stop self-assessing and get the skin mapped, ideally once specialist acne treatment in Singapore has the acne itself under control.
Acne marks: brown PIH and red PIE
An acne mark is flat discolouration left once a spot has healed. The texture of the skin is intact, and only the colour has changed. Goodman and Baron’s widely used acne scar grading scale describes these flat marks as a problem of colour rather than contour, and the Dermatological Society of Singapore scores them as grade 0, not as scars.
Post-inflammatory hyperpigmentation: brown and grey marks
PIH is extra melanin deposited in the skin after acne inflammation. It looks brown or tan when the pigment sits near the surface, and greyer when some of it sits deeper. It is especially common in Asian skin: the Asian Acne Board found PIH in 58.2% of acne patients, most of whom had only mild to moderate acne.
Sun makes PIH darker and slower to fade, and the Dermatological Society of Singapore’s guidelines note that tropical sun exposure increases the risk of PIH after acne. Daily sunscreen, controlling new breakouts and not picking are the foundations. Our guide on how to fade dark marks from acne covers the treatments with evidence behind them and how long they take.
Post-inflammatory erythema: pink and red marks
PIE is caused by small blood vessels that stay widened or damaged after a spot heals, leaving a flat pink, red or purplish mark. It is easy to see on lighter skin. In skin of colour, acne redness can be harder to spot and may show up as brown pigment instead, according to a 2026 systematic review of acne-induced pigmentation.
Sun matters here too. The Dermatological Society of Singapore’s guidelines state that tropical sun exposure prolongs post-acne redness, so sunscreen helps red marks as well as brown ones. Red marks that persist are treated with vascular approaches that target blood vessels, such as the 585 nm yellow light laser used for redness and vascular marks, rather than pigment treatments.
What acne scars are
An acne scar forms when inflammation damages collagen in the dermis and the skin repairs itself imperfectly, leaving either a depression or a raised scar. More than 80% of acne scars are depressed, and they fall into three types: ice pick, boxcar and rolling. The Dermatological Society of Singapore’s guidelines state that post-acne scars cannot be reversed, only made less noticeable. Our guide to types of acne scars explains how to recognise each one.
Why the difference matters in Singapore
Treating the wrong problem wastes time, and in pigment-prone skin it can create a new one. Scar procedures injure the skin on purpose to rebuild collagen, and that injury can leave marks behind. In a 2022 study of fractional CO2 laser for acne scars in 82 patients in China with Fitzpatrick skin types III and IV, 73% developed PIH after treatment, and it lasted longer than three months in 32%. For someone whose “scars” are actually flat brown marks, that is a poor trade.
The reverse mistake is just as common. Brightening serums and sunscreen do not lift a dent, so months spent treating a scar as a mark rarely change what the side light shows. The plan also has an order. Active acne is usually controlled first, marks are calmed, and scar procedures come after, sequenced so that each step does not undo the last.
At Skincodes, Dr Ang Sue-May, who subspecialised in acne and acne scarring under Professor Tony Chu at Hammersmith Hospital in London, assesses marks and scars separately before recommending anything. Where true scarring is present, options for acne scar treatment in Singapore are matched to the scar types found.
Marks or scars: the next step
Smooth, flat colour is a mark and usually fades with sun protection, time and the right topical care. A dip, pit or bump is a scar and needs procedural treatment to improve. When a spot is both, or the acne is still active, a proper assessment saves months of treating the wrong thing.
If you are not sure what you are looking at, book a skin assessment with Dr Ang Sue-May to have your marks and scars mapped before choosing treatment.
Conclusion
Marks are a colour problem and usually fade with time and sun protection. Scars are a structural problem and need procedural treatment to improve. Mistaking one for the other is the most expensive assumption in post-acne care, because it sends patients to the wrong serum, the wrong laser, or the wrong expectation.
Book a skin assessment with Dr Ang Sue-May at Skincodes to map what you actually have on your skin and get a treatment plan that targets the real problem.
FAQs About Acne Marks vs Acne Scars
Do acne marks go away on their own?
Usually, but it can take longer than expected. Red marks (PIE) and brown marks (PIH) both fade because the skin’s structure is intact. In the Asian Acne Board study, PIH lasted at least a year in more than half of patients. Daily sunscreen, controlling breakouts and not picking all help marks fade faster.
Can acne marks turn into scars?
No. A flat mark is a change in colour, and it does not become a dent or bump over time. A scar forms from collagen damage during the original breakout, often in deeper or more inflamed spots. A mark can sit on top of a shallow scar, which makes the two easy to confuse.
How can I tell if my acne mark is actually a scar?
Run a fingertip across it and look at it with light coming from the side. A mark feels smooth and casts no shadow. A scar feels like a dip, pit or bump and casts a shadow. If a dent softens when you gently stretch the skin, it is likely a tethered rolling scar.
Why are some acne marks red and others brown?
Red or pink marks are post-inflammatory erythema, caused by widened blood vessels, and they fade briefly when pressed with a clear glass. Brown or grey marks are post-inflammatory hyperpigmentation, caused by extra melanin. Many people have both. In darker and Asian skin, brown marks are more common and redness can be harder to see.
Do I need laser for acne marks?
Usually not as a first step. Most marks improve with daily sunscreen, acne control and topical treatment. Laser can help red marks that persist or brown marks that stall, but in pigment-prone skin any energy treatment carries a risk of new PIH, so it should be chosen by a dermatologist after the mark type is confirmed.
If I have both acne marks and acne scars, what gets treated first?
Active acne comes first, because new breakouts create new marks and scars. Marks are then calmed with sun protection and topical care. Scar procedures follow, since they can trigger temporary pigmentation in Asian skin: one study of fractional CO2 laser found PIH in 73% of patients with skin types III and IV.