Fractional and thulium laser for hair loss: how 1927 nm and 1550 nm lasers work, the 2026 evidence and Malaysian skin

Laser treatment for thinning hair used to mean one thing in Malaysia: a red-light cap or helmet, or a low-level laser session at a centre. Lately a different kind of laser has started to appear in aesthetic clinics here and around Asia. It is called a fractional laser, and the versions most often mentioned for hair are the 1927 nm thulium laser and the 1550 nm erbium-glass laser. Clinics in Korea, Thailand and Indonesia have published small studies on them, and two large reviews in 2026 pulled the evidence together for the first time.

This guide explains what a fractional laser does to the scalp, how it differs from low-level light therapy, what the studies actually found, who might be a reasonable candidate, what a course usually involves, the risks for Malaysian skin types, and the questions to ask before you pay for a package. It is general information, not personal medical advice. If you are still working out what kind of hair loss you have, start with scalp analysis and trichoscopy and DHT and pattern hair loss.

The short answer

• What it is: A fractional laser splits its beam into thousands of microscopic treatment zones, so it treats a fraction of the skin at a time and leaves healthy skin in between to help healing ¹.
• Why it is used for hair: The tiny controlled injuries appear to trigger wound-healing signals around the follicle, and the channels they create may help topical treatments such as minoxidil or growth factor serums get into the scalp ^{2 3 4}.
• What the evidence says: A 2026 meta-analysis of 15 studies and 1,097 patients found that fractional laser improved hair density compared with control treatments, with mostly mild side effects such as redness, pain and itch ⁵. A scoping review the same year noted that most of the data come from small studies and that larger randomised trials are still needed ⁶.
• Where it fits: It is best thought of as an add-on to proven treatments, not a replacement. Combining laser with minoxidil or another topical generally did better than single treatments in the studies ^{5 7}.
• What it cannot do: It does not change the genetic and hormonal drivers of pattern hair loss. Medicines such as minoxidil and finasteride remain the guideline-backed foundation ⁸.

How hair loss works, briefly

To judge any hair treatment, it helps to know what is going wrong. Each follicle runs through a cycle: a long growing phase (anagen) that can last several years on the scalp, a short transition phase (catagen), and a resting phase (telogen) after which the hair sheds and a new one starts. In androgenetic alopecia, the common pattern type in men and women, follicles that are sensitive to dihydrotestosterone (DHT) gradually shrink. The growing phase gets shorter, each new hair comes back finer and shorter, and eventually some follicles produce only tiny, almost invisible hairs. This shrinking is called miniaturisation.

That process explains why timing matters. A follicle that is miniaturised but still alive can often respond to treatment. An area that has been shiny and smooth for many years usually has far fewer working follicles left, and no laser, serum or pill can create new ones there. It also explains why every non-surgical treatment needs ongoing use: the hormonal drive behind pattern loss does not switch off.

What a fractional laser actually does

Fractional, ablative and non-ablative

A conventional resurfacing laser treats the whole surface of the skin at once. A fractional laser instead creates columns of heat, called microthermal treatment zones, separated by untouched skin ¹. The untouched skin heals the treated columns quickly, which is why downtime is shorter than with older lasers.

There are two broad families:

• Non-ablative fractional lasers heat the tissue without vaporising the surface. The 1550 nm erbium-glass and the 1927 nm thulium lasers belong here. The thulium laser acts more superficially, while the 1550 nm laser reaches deeper into the dermis ^{2 1}.
• Ablative fractional lasers, such as fractional CO2 and erbium:YAG, vaporise tiny columns of tissue. They are more intense and usually need longer recovery ¹.

The first fractional device on the market was a 1550 nm non-ablative laser designed for facial skin ¹. Dermatologists later began testing similar devices on the scalp.

Why a controlled injury might help follicles

Researchers have proposed two main ways a fractional laser could help thinning hair.

1. Wound-healing signals. Laser and light treatments are thought to improve the environment around the follicle by increasing growth factors and signalling molecules. In a Korean split-scalp study, a 1927 nm thulium laser produced small zones of heated tissue in the upper and middle dermis without obvious ablation, and treated patients showed increases in hair density and thickness ².
2. A delivery route for topicals. The microscopic channels may help a medicine or serum applied straight afterwards penetrate further. This idea is called laser-assisted drug delivery. A Thai trial suggested that photothermal injury and better skin penetration were the likely reasons the laser and minoxidil combination did better than minoxidil alone ³. A 2024 review found that laser-assisted delivery has been studied with minoxidil, PRP, growth factors and steroids, but some trials did not find it better than single treatment or microneedling-assisted delivery ⁴.

How it differs from low-level light therapy

The names sound similar, but the two work differently.

For more on the second column, see low-level laser therapy for hair loss and laser caps at home. The American Academy of Dermatology describes low-level laser as safe and painless but notes that it needs many sessions over months ⁹.

What the studies found

Most fractional laser studies are small, many come from Asia, and they use different devices, settings and outcome measures. Read the results with that in mind.

The 2026 reviews

• Meta-analysis of 15 studies (1,097 patients): Fractional laser improved hair density compared with controls. There was no clear difference between ablative and non-ablative lasers, or between the 1565, 1550 and 1927 nm wavelengths. Laser combined with other treatments such as minoxidil showed an advantage over those treatments alone. Side effects were mostly mild to moderate redness, pain and itch that settled on their own ⁵.
• Meta-analysis of 37 studies (3,298 patients) on lasers and energy devices: Both low-level light and fractional lasers improved hair measures. Combination protocols, where fractional lasers were paired with minoxidil, PRP or growth factors, had a higher clinician-rated improvement rate (95.3%) than laser alone (77.2%). Side effects were mild and short-lived ⁷.
• Scoping review: Fractional lasers look promising with few side effects reported, but the data are largely from smaller studies, so larger randomised trials are needed before firm conclusions ⁶.

Key individual studies

• 1550 nm in women (Korea, 2011): 28 women with female pattern hair loss had ten sessions two weeks apart. Among the 27 who finished, average density rose from about 100 to 157 hairs per square centimetre and hair shafts became thicker. There was no untreated comparison group ¹⁰.
• 1927 nm thulium, split scalp (Korea, 2018): Ten patients had 12 weekly sessions. Hair density and thickness increased, and applying a growth factor solution after the laser on one side gave extra benefit on that side ².
• 1550 nm plus minoxidil (Thailand, 2019): 30 men used 5% minoxidil on the whole scalp for 24 weeks and had laser on one side only. The laser-plus-minoxidil side did significantly better on density, hair diameter and photo assessment, with no serious side effects ³.
• 1927 nm in Indonesia (2025): Ten patients had two sessions two weeks apart without anaesthesia. Photo scores and satisfaction improved at short-term follow-up, pain was minimal and no treatment-related side effects were reported. The follow-up was only weeks long ¹¹.
• Thulium-assisted serum delivery (Germany, 2026): In a small randomised pilot, hair density rose by about 25.6% with laser plus serum plus red light, 22.7% with laser plus serum, and only 4.9% with laser and red light without serum. Hair thickness improved only in the serum groups. Some authors reported lecture fees from a laser manufacturer ¹².
• Women, fractional CO2 vs radiofrequency (Egypt, 2026): In 30 women using 5% minoxidil, fractional microneedling radiofrequency on one side did better than fractional CO2 or minoxidil alone ¹³.

What this adds up to

The pattern is fairly consistent: fractional lasers seem to help, mainly as a booster for a topical treatment, and in the German study the laser on its own did little without the serum ¹². The weak points are small sample sizes, short follow-up, few properly blinded comparisons, wide variation in settings, and some industry links. There is little long-term data on what happens after sessions stop. Because pattern hair loss continues, any gain would be expected to fade without maintenance, as with other non-surgical options ⁹.

Who might consider it, and who should not

Fractional laser may be worth discussing if:

• you have a confirmed diagnosis of early to moderate androgenetic alopecia, in either sex, with miniaturised hairs still present;
• you are already using minoxidil or another proven treatment and want to see whether an add-on helps;
• you are comfortable with clinic visits every one to four weeks for several months;
• you understand that the evidence is still developing.

Be cautious, or ask a dermatologist first, if:

• you have patchy hair loss, scarring alopecia, or an inflamed, scaly or infected scalp, which need a diagnosis and specific treatment first (see alopecia areata and scarring alopecia);
• you have a history of keloids, poor wound healing, or post-inflammatory dark marks after acne or injury;
• you are pregnant, or are taking medicines that affect healing or light sensitivity;
• you have recently had a hair transplant, SMP or another scalp procedure.

What a course usually looks like

Protocols vary, so these are general steps based on the published studies rather than a fixed recipe.

1. Assessment. History, scalp examination, photographs and often trichoscopy. Blood tests may be suggested if another cause such as iron deficiency or thyroid disease is suspected ⁹.
2. Preparation. The scalp is cleaned. A numbing cream may or may not be used; the Indonesian study used none ¹¹.
3. The laser pass. The device is moved over the thinning areas through parted hair. Most people describe warmth or prickling.
4. Topical application. Many protocols apply minoxidil, a growth factor serum or PRP immediately afterwards to take advantage of the channels ⁴.
5. Aftercare. Expect redness and sometimes mild swelling for hours to a few days. Gentle washing and sun protection are usually advised ¹.
6. Repeat. Studies used schedules from weekly sessions for 12 weeks to sessions every two weeks for about five months ^{2 10}.
7. Review. Standardised photos and measurements at three to six months show whether it is helping enough to continue.

Typical timeline

• Day 0 to 3: redness, warmth, possibly itch or tiny scabs.
• Weeks 2 to 8: sessions continue; little visible change yet.
• Months 3 to 6: the period in which most studies measured improvements in density and thickness ^{3 10}.
• After the course: maintenance sessions or ongoing topical treatment are usually discussed, because the underlying cause continues.

Risks and side effects

Reported side effects in hair studies were mostly mild: redness, pain during treatment, itching and short-lived swelling ^{5 7}. With fractional lasers more generally, other possible problems include crusting, acne-like breakouts, cold sore flare-ups, infection and contact dermatitis ¹.

The risk most relevant to many Malaysians is post-inflammatory hyperpigmentation. Dark patches can follow skin inflammation or injury, are more common in people with darker skin types, and can take months to fade ¹⁴. DermNet notes that fractional laser itself can cause this, more often in people with a history of melasma or previous dark marks ¹. On a scalp with plenty of hair this is rarely visible, but on a thin crown or a receding hairline it can be. Ask how the settings will be adjusted for your skin type and whether a test area is sensible.

Malaysian context

• Sun and heat. Freshly lasered skin is more sensitive. In Malaysia's strong sun, a thinning scalp is exposed most of the year, so plan sessions when you can avoid long outdoor exposure for a few days, and use a hat or scalp sunscreen as advised.
• Sweat and humidity. Heavy sweating, the gym and hot outdoor work can irritate treated skin for the first day or two. Ask when you can resume exercise.
• Head coverings. If you wear a tudung, songkok or helmet daily, ask about keeping the area clean and loosely covered while it settles. See hijab and scalp care.
• Cost. Prices are set by each provider and depend on the device, the area and the number of sessions. Ask for a written quote for the full course and any maintenance, and compare it with the ongoing cost of proven treatments; see hair loss treatment costs in Malaysia.
• Who operates the device. A laser that injures the skin on purpose should be used after a proper assessment, by trained staff who can manage complications. Ask who will examine you and who will hold the handpiece.

Comparing the main options

For more on combining these, see combining hair loss treatments and microneedling for hair loss.

New tech to watch

Laser devices are part of a wider push to get treatments deeper into the follicle with less effort. A November 2026 paper described a prototype electronic comb that delivers mild electrical stimulation and genetic material into the scalp while combing. It worked in mice, but it has not been tested in people, so it is research news rather than a treatment option ¹⁸. Oral options are moving too; see the extended-release minoxidil pill.

Common myths

• "Laser means fast results." Studies measured changes over three to six months, the same slow pace as other treatments ³.
• "All hair lasers are the same." Fractional lasers injure the skin on purpose; low-level light devices do not. They have different risks and evidence.
• "Laser can replace minoxidil or finasteride." The best results in studies came from combinations, and medicines remain the foundation ^{5 8}.
• "It works on any bald area." It can only act on follicles that still exist.
• "No side effects." Most are mild, but pigment changes are a real concern for darker skin ¹⁴.

A practical checklist before you book

• Get your hair loss type confirmed, ideally with trichoscopy.
• Ask which laser and wavelength will be used and why.
• Ask what will be applied after the laser and whether it is a registered product.
• Ask how many sessions, how far apart, and what maintenance looks like.
• Ask how results will be measured: standardised photos, hair counts, or both.
• Ask how settings are adjusted for your skin tone and how pigment changes are handled.
• Get a written quote for the full course, including follow-ups.
• Keep using any proven treatment unless your doctor advises otherwise.
• Set a review point at three to six months and be ready to stop if there is no clear benefit.

Key takeaways

• Fractional lasers, including 1927 nm thulium and 1550 nm erbium-glass, create microscopic treatment zones that may support follicles and help topicals penetrate.
• Two 2026 meta-analyses found improvements in hair density with mostly mild side effects, but the studies are small and short.
• The strongest results came from combining laser with minoxidil, PRP or growth factors, not from laser alone.
• Darker Malaysian skin types should discuss pigment risk and sun care before starting.
• Confirm your diagnosis first, keep proven treatments going, and review progress honestly at three to six months.

Frequently asked questions

Is a fractional laser the same as a laser cap?

No. A fractional laser creates microscopic heated or vaporised zones in the skin and is used in a clinic, while laser caps and helmets deliver low-energy light that does not injure the skin. They have different risks and different evidence.

Which is better for hair, 1927 nm thulium or 1550 nm erbium-glass?

A 2026 meta-analysis found no clear difference in hair density results between the 1565, 1550 and 1927 nm wavelengths, or between ablative and non-ablative lasers. The choice usually depends on the provider's device, your skin type and what will be applied afterwards.

How many sessions are usually needed?

Published studies used schedules ranging from weekly sessions for 12 weeks to sessions every two weeks for about five months. Ask for a clear plan with a review point at three to six months.

Does it hurt?

Most people describe warmth, prickling or stinging during treatment, followed by redness for hours to a few days. In one Indonesian study, sessions were done without anaesthesia and pain was reported as minimal.

Can I stop minoxidil if I start laser?

The best results in studies came from combining laser with minoxidil or another topical, not from laser alone. Do not stop a proven treatment without discussing it with your doctor.

Is it safe for darker skin?

Side effects in hair studies were mostly mild, but fractional lasers can cause dark marks after inflammation, which are more common in darker skin types. Ask how settings will be adjusted and whether a test area is sensible.

Will the results last after I stop?

There is little long-term data. Because pattern hair loss continues, any improvement would be expected to fade without ongoing treatment, as with other non-surgical options.

Educational content. Not medical advice.