The appropriate device for scar treatment depends on the scar's shape, color, and depth.
Resurfacing lasers are better suited to depressed scars, vascular lasers to red marks, and pigment lasers to residual pigmentation.
Identifying the scar type is the starting point for planning; in practice, several devices are often combined (individual variation applies).
➊What does scar laser treatment mean?
Scar laser treatment does not refer to a single device, but collectively describes selecting different lasers for the shape and color of a scar.
After acne, depressed scars, red residual marks, and brown pigmented marks may remain in different forms.
Because these three have different causes, they often cannot be resolved together with one laser.
Depressed scars arise from collagen loss caused by acne inflammation; red marks remain because small vessels stay dilated after inflammation; pigmented marks develop through post-inflammatory pigment deposition.
When we use the term scar laser during consultation, we first clarify which type is being addressed.
People searching for a scar laser usually want to know, “Will this scar disappear?” But the first clinical step is identifying what type of scar it is.
Once the type is distinguished, both device choice and recovery period change.
➋Different scar types call for different devices
Depressed scars are areas of lost dermal collagen, so treatment centers on encouraging collagen regeneration.
Red marks, by contrast, are caused by dilated vessels rather than pigment and require a vascular target.
For residual pigmentation, lasers that break down melanin are more appropriate.
| Scar type | Cause | Suitable device category |
|---|---|---|
| Depressed (atrophic) scars | Collagen loss | Pore and texture treatment devices (such as Potenza) |
| Red marks | Small-vessel dilation | Vascular laser (GV laser) |
| Pigmented marks | Post-inflammatory hyperpigmentation | Pigment lasers (PicoWay and StarWalker) |
| New, early scars | Ongoing inflammation and erythema | Vascular laser considered first |
GV vascular lasers heat hemoglobin in the dilated vessels of red marks and are used to reduce residual redness after acne.
For pigmented marks, picosecond and nanosecond lasers such as PicoWay and StarWalker work by fragmenting pigment.
“Scarring is not a single-cause problem, but the overlapping result of collagen loss, vessel dilation, and pigment deposition.”
➌Which scar type do I have?
A visible depression in the skin surface suggests an atrophic scar. If the surface is flat but redness remains, it is more likely a red mark; brown or dark discoloration suggests pigmentation.
It is not unusual for one person to have all three.
It may be useful to observe in natural light whether a depression remains when the skin is gently stretched, or whether pressing makes the color temporarily fade.
However, visual distinction is often difficult, so we also assess with a Wood's lamp or magnified imaging in the clinic.
- ✓ Depressed scars: Focus on collagen and texture
- ✓ Red and pigmented marks: Include vascular or pigment lasers
- ✓ Mixed types: Combine devices in a sequence suited to each type
➍When will changes appear, and how does recovery progress?
Scar laser treatment is usually a process in which results accumulate gradually over multiple sessions, rather than a single completed treatment.
Vascular lasers often produce noticeable changes with relatively few sessions, while depressed scars requiring collagen regeneration generally need more time.
| Scar type | Typical sessions | Recovery characteristics |
|---|---|---|
| Red marks | Around several sessions | Redness eases within days; individual variation |
| Pigmented marks | Repeated sessions | May look temporarily darker before gradually fading |
| Depressed scars | Multiple sessions over a longer period | Collagen remodeling may take several months |
After pigment treatment, discoloration may temporarily become more prominent; this is described as part of the process by which fragmented pigment is cleared through the epidermis.
Without thorough sun protection during this period, recovery may slow or pigment may darken again, making aftercare important.
➎Side effects and precautions
Temporary redness or swelling can occur in the treated area and is generally reported to settle within several days.
With pigment lasers, darker skin tones or excessive energy settings have occasionally been associated with increased pigmentation.
Vascular lasers may cause temporary bruising.
Treatments addressing pores and texture may leave redness and flaking for several days; strong skincare ingredients and vigorous friction should be avoided during recovery.
Whatever the device, sun protection before and after treatment is among the most important factors affecting the result.
➏Who I recommend treatment for, and when the approach differs
I recommend scar treatment when acne has become reasonably stable but depressed marks, redness, or pigmentation remain bothersome in daily life.
When the scar type is clearly distinguishable, it is relatively straightforward to set a goal and choose a device.
If acne is still actively developing, however, treating inflammation before scar laser treatment may be the appropriate order.
If someone expects a dramatic change in one session, I first explain honestly that scar treatment requires multiple visits and time.
Several sessions can contribute to clinic revenue, but that does not automatically mean that number is necessary for the patient; I make that distinction clear as well.
“Goals and timelines differ by scar type, and resolving every type simultaneously in a short period is difficult.”
We decide the sequence by assessing scar type, skin condition, and expected results together (individual variation applies).
QFrequently asked questions
It depends on scar type and depth.
Some superficial scars show change within a few sessions, while deep depressed scars or longstanding pigmentation often require several treatments and recovery periods.
Individual variation applies.
Yes.
Because texture-focused and vascular lasers target different tissues, we often assess the condition and plan their sequence and combination during consultation.
It depends on the device and intensity, but redness generally settles within several days.
When treating pigmentation, it may temporarily look darker before gradually fading.
Some fade naturally, but persistent marks are often treated with pigment lasers to seek improvement.
Without sun protection, fading may be slower.
Before a scar stabilizes, redness-focused lasers are often considered first, while texture treatment is generally introduced once the area has settled to a degree.
Timing is assessed during consultation.
First, scar shape and color and the skin's condition are assessed; suitable devices and sequence are then planned.
Treatment proceeds according to a plan tailored through consultation (individual variation applies).
Scar laser treatment is not simply erasing a scar; it is separating and addressing its different problems one by one.
Ultimately, it is not the name of a single procedure, but an approach that selects and combines devices according to scar type.
An accurate answer about your scar type and the combination needed requires examining its actual condition.
I recommend a consultation at LUNN Clinic.
— Dr. Park Hyungkwon, Board-Certified Dermatologist and Medical Director, LUNN Clinic —
In accordance with Article 56 of the Medical Service Act, possible side effects include erythema, swelling, temporary pigmentation, and, rarely, worsening of scars.
Treatment and procedure results may vary according to the individual's condition.
This article is intended to provide medical information.
