What are stretch marks, and why are they difficult to remove?
Stretch marks, or striae distensae, are a form of dermal scarring. They develop when skin expands or changes faster than its supporting collagen and elastic-fibre network can adapt. Pregnancy, puberty, rapid weight change, muscle gain, corticosteroid exposure and some hormonal disorders can all contribute.
Early stretch marks are often pink, red or purple (striae rubrae). Older ones usually become pale, silvery and slightly depressed (striae albae). That colour difference matters because a laser that targets redness is not doing the same job as a fractional laser intended to remodel an older, pale scar.
No current treatment reliably restores stretched skin to completely normal skin. The realistic goal is improvement in colour, texture, width or depth — not complete erasure.
Can laser treatment actually remove stretch marks?
Laser treatment can make stretch marks less visible, but “remove” is usually the wrong word. Recent systematic reviews still conclude that there is no single gold-standard treatment and that complete clearance is uncommon.
The amount of improvement varies with the age and colour of the striae, your skin tone, the body area, the device used and how aggressively it is treated. Older white stretch marks often require collagen-remodelling treatments and several sessions. Newer red marks may respond better to vascular-targeting treatment.
Which lasers are used for stretch marks?
Several very different devices are sold under the broad label “stretch-mark laser.” They should not be treated as interchangeable.
- Fractional CO₂ laser: an ablative fractional laser that creates microscopic columns of controlled thermal injury. It can improve texture and stimulate remodelling, but it also brings more redness, crusting and risk of post-inflammatory hyperpigmentation (PIH).
- Non-ablative fractional lasers such as 1540–1565 nm erbium-glass systems: heat the dermis while leaving most of the surface intact. Recovery is usually easier, but several sessions are commonly needed.
- Vascular lasers such as pulsed-dye laser (PDL) or some 532 nm systems: mainly target the redness of newer striae rubrae rather than the depressed texture of mature white striae.
- Picosecond and other fractional devices: have emerging evidence, but they are not automatically superior simply because the technology is newer.
Does fractional CO₂ work better than other treatments?
Not clearly. Fractional CO₂ is one of the most studied options and can produce visible improvement, but recent comparative evidence does not show that it is universally superior.
A 2024 network meta-analysis of randomized trials found no significant difference in reduction of stretch-mark width between ablative lasers, non-ablative lasers, radiofrequency and IPL. A 2025 meta-analysis comparing fractional CO₂ with microneedling found similar clinical improvement and patient satisfaction, while PIH was significantly more frequent after CO₂ treatment.
That is an important practical point: the strongest-looking treatment on a clinic menu is not always the best trade-off for your skin.
Are red and white stretch marks treated differently?
Usually, yes.
Red or purple stretch marks still contain a vascular component. A dermatologist may use a vascular laser to reduce colour and sometimes combine it with a remodelling treatment.
White or silvery stretch marks are more mature scars. The main target is no longer redness but dermal texture and collagen organisation. Fractional CO₂, non-ablative fractional lasers, microneedling and RF microneedling are more commonly considered here.
Someone promising the same device and settings for every stretch mark is oversimplifying the problem.
What results can I realistically expect?
Expect improvement rather than disappearance. Studies use different scoring systems, wavelengths and treatment schedules, which makes a universal percentage misleading.
A 2024 systematic review of 151 studies found that complete responses were uncommon across treatments. This matches clinical reality: stretch marks may become narrower, smoother, less red or less obvious, while some residual lines usually remain.
Results also develop gradually. Collagen remodelling continues for weeks to months after a session, so judging treatment after a few days is premature.
How many sessions are usually needed?
Most laser protocols use a series rather than one treatment. Three or more sessions, often spaced several weeks apart, are common in clinical studies.
The exact plan depends on the device, treatment intensity, location and your response. More sessions do not guarantee complete clearance, and increasing laser energy simply to “go stronger” can increase pigment problems and scarring risk.
What does the treatment feel like and what is the downtime?
Downtime depends strongly on the technology.
- Non-ablative fractional laser: usually causes heat, redness and mild swelling for a few days.
- Fractional CO₂: can cause marked redness, swelling, pinpoint crusting and a rough or bronzed appearance for several days; residual redness may last longer.
- Vascular laser: may cause temporary redness, swelling or purple bruising depending on settings.
Topical anaesthetic is often used for fractional treatments. Larger body areas can be uncomfortable even with numbing.
What are the main risks of laser treatment for stretch marks?
Common short-term effects include redness, swelling, tenderness, dryness and temporary darkening. More important complications include:
- post-inflammatory hyperpigmentation or, less often, hypopigmentation;
- prolonged redness;
- blistering or burns if settings are too aggressive;
- infection after ablative treatment;
- rare scarring;
- reactivation of herpes in susceptible areas.
Recent meta-analyses are especially relevant to pigment risk. In one 2025 analysis, fractional CO₂ produced significantly more PIH than microneedling (risk ratio 8.37, although absolute rates varied considerably between the small studies). A separate 2024 meta-analysis similarly found less PIH with fractional microneedle radiofrequency than with fractional CO₂.
Is laser safe for darker skin?
It can be, but device choice and settings matter more. Melanin absorbs or interacts with some wavelengths, and skin that develops PIH easily requires a more conservative plan.
Fractional CO₂ is not automatically contraindicated in darker skin, but the pigment-risk discussion should be explicit. Non-ablative fractional lasers, microneedling or RF microneedling may offer a better risk–benefit balance for some patients.
A practitioner should assess your Fitzpatrick skin type, recent tanning, history of PIH and the colour of the stretch marks before choosing a device.
How does laser compare with microneedling or RF microneedling?
For many patients, the difference is smaller than marketing suggests.
Recent systematic reviews found microneedling and fractional CO₂ to produce broadly comparable improvements. Microneedling tends to carry less pigment risk but can be painful. RF microneedling also has evidence for striae and may be useful when texture is the main issue, with a lower PIH rate than fractional CO₂ in comparative analyses.
There is no rule that every stretch mark needs a laser. A good consultation should explain why a specific energy source is being chosen rather than simply selling the device a clinic owns.
Do creams, PRP or combination treatments work better with laser?
Combination treatment is common, but stronger evidence does not exist for every add-on.
Recent reviews describe combinations involving PRP, microneedling, fractional CO₂ and topical agents. Some studies report additional improvement, but protocols are inconsistent and many trials are small. “Combination” should therefore not be interpreted as automatically better.
Topical tretinoin may help some newer stretch marks, but it is not suitable during pregnancy and requires medical guidance. Oils and moisturisers can improve comfort and dryness, but they do not reliably erase established striae.
When should stretch marks be assessed medically before cosmetic treatment?
Most stretch marks are harmless. A medical assessment is more important when they appear rapidly without an obvious explanation, are unusually wide or extensive, or develop alongside symptoms suggesting corticosteroid excess or another hormonal disorder.
Likewise, active pregnancy, recent major weight change, uncontrolled skin disease or a strong tendency to abnormal scarring may be reasons to postpone treatment.
How should I choose between laser and another option?
Start with the stretch mark, not the machine.
- If the marks are still red, ask whether the treatment is targeting redness or texture.
- If they are mature and white, ask what evidence supports the proposed remodelling device.
- If you have darker skin or a history of PIH, ask specifically about pigment risk and alternatives.
- If a clinic promises complete removal, be cautious.
The best plan is usually the one that gives a realistic improvement with an acceptable risk and recovery burden for your skin — not the most aggressive treatment available.
