The most useful thing I say in a first consultation
"Which of these is actually bothering you?"
Nearly everyone who sits down and says they want their acne scars treated is looking at three or four different problems at once and calling them one thing. Some of those problems respond beautifully. One or two barely respond at all. And at least one of them, more often than not, is not a scar.
So before anything else, here is the map. It is the single most useful thing on this page.
| Scar type | What it looks like | What actually works |
|---|---|---|
| Icepick | Narrow, deep, like a pinprick. Wider at the surface than it is at the base, and it goes further down than you think. | TCA CROSS, punch excision |
| Boxcar | Round or oval with sharp, defined vertical walls. Looks a little like a chickenpox scar. | Fractional resurfacing, RF microneedling, punch elevation |
| Rolling | Broad, shallow, undulating. Comes and goes depending on the light, which is the giveaway. | Subcision first, then resurfacing or biostimulator |
| Hypertrophic and keloid | Raised rather than depressed. More common on the jaw, chest and back. | Intralesional treatment, vascular laser. Never aggressive resurfacing |
| Macular erythema | Flat, red or brown marks with no change in texture at all. | Time, sun protection, vascular or pigment laser. Not a scar |
If you take nothing else away: there is no such thing as "acne scar treatment". There are four scar shapes and a discolouration that pretends to be one, and matching the tool to the shape matters more than which machine a clinic happens to own.
Why skin type changes the whole calculation
Most acne scar protocols you will read online were written for Fitzpatrick I to III skin. Most of my patients are IV and V.
The difference is not cosmetic. Melanocytes in darker skin respond to injury by producing pigment, which means the same laser setting that produces a good result in Stockholm can produce eight months of brown discolouration in Penang. The scar improves and the patient is unhappier than when they started.
So the risk I am managing is rarely the scar itself. It is post-inflammatory hyperpigmentation, and almost every conservative decision I make traces back to it: lower energies, longer intervals, priming the skin for weeks beforehand, and a strong preference for six gentle sessions over two heroic ones.
This is slower. It is also why patients who have been treated aggressively elsewhere sometimes arrive with two problems instead of one.
The treatments, and what each one is genuinely for
Here is everything we use, roughly in the order I reach for it.
TCA CROSS
Chemical reconstruction of skin scars. A high concentration of trichloroacetic acid placed precisely into the base of an icepick scar with a fine applicator, prompting it to fill from below over several weeks.
It is the answer for icepick scars, which lasers largely ignore because the scar is narrow and deep and resurfacing only touches the top. It stings for about ten seconds per scar. It is unforgiving of imprecision, particularly in darker skin, because acid on healthy skin creates exactly the pigmentation we are trying to avoid. Expect three to six rounds on the same scar.
Subcision
A needle or blunt cannula passed beneath a rolling scar to release the fibrous tethers holding it down.
This is the step people skip, and skipping it is why so many rolling-scar patients are disappointed. The scar is depressed because it is anchored from underneath, not because the surface is uneven. Resurface the top and the tether pulls it straight back down. Release the tether first and everything you do afterwards works better. Bruising for a week or so is normal and looks worse than it is.
Fractional resurfacing, ablative and non-ablative
Treating a fraction of the surface in microscopic columns and leaving healthy skin in between to speed the healing. Ablative fractional, typically CO2 or Er:YAG, removes tissue and gives the strongest result per session. Non-ablative fractional heats without removing, which is gentler and slower.
Excellent for boxcar scars and overall texture. In IV and V skin I run lower densities and lower energies than the manufacturer's protocol suggests, and I would rather book you for five sessions than promise you two.
Radiofrequency microneedling
Insulated needles deliver radiofrequency energy at a set depth in the dermis, heating below the surface while leaving the epidermis comparatively untouched.
This is my workhorse in darker skin, and the reason is simple: it does not rely on light being absorbed by pigment, so the pigmentation risk is meaningfully lower than with ablative lasers. Good on boxcar and rolling scars, and it stacks well with subcision in the same appointment.
Microneedling with or without PRP
Mechanical needling to trigger collagen remodelling, sometimes combined with your own platelet-rich plasma.
Modest on its own and often oversold. Where it genuinely earns its place is safety: pigmentation risk is very low, so it can be repeated often and used to maintain progress between stronger sessions. For mild rolling scars and general skin quality it can be enough.
Punch excision and punch elevation
For a small number of scars, surgery is simply the correct answer. A deep icepick scar can be cut out and closed, leaving a fine line instead of a pit. A boxcar scar with an intact floor can be lifted and set flush.
Nobody markets this, because it is unglamorous and it is done one scar at a time. It is also the only thing that works for certain scars, and I would rather do three punches than twelve laser sessions that will never reach them.
Biostimulators and fillers
For broad rolling scars where volume is genuinely missing, usually after subcision has released the tether. A collagen biostimulator rebuilds gradually across an area, while hyaluronic acid filler lifts a specific soft depression.
Not for sharp-walled boxcar or icepick scars, where product simply sits beneath an intact wall and changes nothing.
Chemical peels
Supporting rather than starring. Useful for surface texture, active congestion and the pigmentation that so often accompanies scarring in Asian skin. Also valuable for priming skin in the weeks before resurfacing, which measurably lowers the pigmentation risk afterwards.
Pigment and vascular lasers
For the marks that are not scars. Picosecond and Q-switched systems for the brown, vascular lasers for the red.
Worth saying clearly: flat red or brown marks left after a spot has healed are not scarring. They are discolouration, they usually fade on their own over six to eighteen months, and treating them urgently is money spent on something time will do for free. Sun protection does more here than any device.
Why I sequence rather than escalate
The instinct when progress feels slow is to turn the machine up. In this skin that instinct is wrong.
A typical course for moderate mixed scarring runs something like this. Settle the acne first, and hold that for three months. Prime the skin. Then subcise the rolling scars and treat the icepick scars with TCA CROSS, because both work below the surface and both need time. Only then bring in resurfacing for texture and boxcar scars, spaced generously. Volume last, if anything is still hollow. Pigment separately, throughout.
Four to eight sessions over six to twelve months, and a realistic target of fifty to eighty per cent improvement.
I know that is less exciting than a before and after taken in flattering light. It is also what actually happens.
What we do before touching a device
Your acne needs to be quiet. Treating scars while new lesions are still forming means creating fresh scars behind the ones we are correcting, and inflamed skin pigments more readily.
We photograph in standardised lighting, because scar progress is gradual and memory is unreliable. Patients routinely believe nothing has changed until they see month one beside month six.
And we talk about sun. Every protocol on this page is undone by unprotected sun exposure in the weeks afterwards, and in this climate that is not a small ask. If you are not willing to be strict about it for a few months, tell me at the start and we will choose gentler options.
Frequently asked questions
TCA CROSS stands for chemical reconstruction of skin scars. A high concentration of trichloroacetic acid is applied into the base of an icepick scar with a fine wooden applicator, prompting it to fill from below. It stings sharply for around ten seconds per scar and then stops. Patients usually describe it as far more tolerable than they expected, and it is one of the few things that genuinely works on icepick scars.
For moderate scarring, expect somewhere between four and eight sessions across six to twelve months, usually combining more than one technique. Anyone promising a fixed number before examining your skin is guessing. Deep icepick scarring may need TCA CROSS repeated three to six times on the same scar.
It can, and in Fitzpatrick IV and V skin that is the central risk rather than a footnote. Post-inflammatory hyperpigmentation after aggressive resurfacing can last months and is more distressing than the original scarring. This is why we prime the skin beforehand, use conservative settings and space sessions further apart than protocols written for lighter skin suggest.
Honestly, no. Realistic improvement for a committed course is somewhere around fifty to eighty per cent, and the aim is skin that reads as normal in ordinary light rather than skin that is flawless under magnification. Any clinic promising complete removal is selling something.
Yes, and this is not a delaying tactic. Treating scars while acne is still active means creating new scars behind the ones being corrected, and inflamed skin responds badly to resurfacing. We want you reasonably clear for three months first.
For mild rolling scars and general texture, sometimes yes. For boxcar or icepick scarring it is rarely enough by itself. Its real value in darker skin is that it is forgiving: the pigmentation risk is low, so it can be repeated safely while more targeted work is done on individual scars.
Useful for broad, soft, distensible rolling scars where volume genuinely is missing, and usually after subcision has released the tether. Not useful for sharp-edged boxcar or icepick scars, where filler simply sits under an intact wall and changes nothing.
Where to start
Bring your questions and, if you have them, photographs from when the acne was active. A fifteen-minute assessment in proper lighting will tell you which of the four shapes you actually have, how much of what bothers you is discolouration rather than scarring, and roughly what a realistic course looks like.
Some patients leave with a plan. Some leave being told to protect their skin and come back in six months, because time is going to do a better job than I would. Both are honest answers.
This article is general educational information about dermatological procedures. It is not medical advice, a diagnosis, or an offer of treatment. All procedures carry risks. Suitability, technique and outcomes vary between individuals and no result can be guaranteed. Treatments described should be performed only by appropriately trained and registered medical practitioners.