Medical Treatments · Skin & Lasers · IN Eternity Clinic
FSX Laser in Singapore
A multi-pass, non-ablative laser protocol that heats the dermis beneath an intact surface, for fine lines, enlarged pores and stretch marks, with the settings changed zone by zone.
Written & medically reviewed by Dr Sin Yong · 8 October 2026
Quick answer
- A multi-pass, non-ablative laser protocol that heats the dermis beneath an intact surface, for fine lines, enlarged pores and stretch marks, with the settings changed zone by zone.
- Used for: Fine Lines & Wrinkles, Enlarged Pores, Stretch Marks.
- Performed by: Dr Sin Yong at IN Eternity Clinic, 9 Scotts Road, Pacific Plaza (beside Orchard MRT).
- Enquire: SkinRev Lab, CityLink Mall (City Hall MRT) passes enquiries to the clinic, or contact IN Eternity Clinic directly on +65 8815 3008.
- Suitability, number of sessions and pricing are decided at consultation; individual results vary.
FSX, short for Flawless Smooth Skin, is the name IN Eternity Clinic gives to Dr Sin Yong's multi-pass laser protocol for skin quality. It belongs to the same LCLR® protocol family as Time Freeze Laser LCLR®, which is used for lifting the jawline. For people comparing FSX laser in Singapore with other resurfacing options, the key point is that FSX is non-ablative: it heats the deeper skin without removing the surface layer.
The protocol combines two types of laser energy, thulium and erbium-glass, in several passes during one session. Each pass is set for a different job, for example softening fine lines, refining pores or working on stretch marks, and the energy is adjusted area by area across the face or body. The aim is collagen remodelling with less downtime than ablative lasers such as fractional CO₂.
How it works
The mechanism,
in plain English
Thulium and erbium-glass lasers both emit mid-infrared light that is absorbed by water in the skin. Erbium-glass energy reaches deeper into the dermis and is used to stimulate collagen for fine lines, textural scarring and stretch marks. Thulium energy is absorbed closer to the surface and is used for brightening and for the upper skin layers. Because neither pass vaporises the surface, the epidermis stays in place and acts as a natural dressing while the dermis heals.
Heat in the dermis causes a controlled injury that triggers the skin's repair process. Fibroblasts produce new collagen and elastin over the following weeks, and the dermis gradually becomes firmer and more even. Around pores, heat directed at the follicle and oil gland can help the opening look tighter. In stretch marks, collagen remodelling may make the marks flatter and less noticeable, though it does not erase them. Changes build over roughly one to two months after each session.
“Non-ablative means a gentler recovery, and it also means change is gradual; FSX trades speed for downtime.”
— Dr Sin Yong, IN Eternity Clinic
- Energy / device
- Thulium and erbium-glass laser energy, delivered as a non-ablative, multi-pass protocol
- Target layer
- Dermis beneath an intact epidermis; upper skin layers for the thulium pass
- Typical session
- About 30 minutes, plus around 45 minutes for numbing cream
- Downtime
- Redness usually settles within hours; after stronger passes, light scabs may last several days
- Performed by
- Dr Sin Yong, IN Eternity Clinic
Is it right for you
Who it suits,
and who it does not
FSX laser in Singapore suits people with fine lines, crepey or rough texture, enlarged pores, mild superficial scarring and early loss of firmness, who want gradual improvement without the week of crusting that ablative lasers bring. It is also used for stretch marks on the abdomen, thighs, hips and arms, particularly when they have turned pale and silvery. People who have had post-acne redness or mild active inflammation may have these addressed within the same plan.
It is not the right tool for deep wrinkles caused by muscle movement, marked sagging, deep boxcar or ice-pick acne scars, or large volumes of loose skin, which need other approaches. People with active infection, open wounds, a recent strong tan or sunburn, or who are pregnant should wait. Those who darken easily after skin injury need conservative settings and careful aftercare. If you have used prescription acne medicine recently, tell the doctor, as timing may need to be adjusted.
Non-invasive alternative at SkinRev Lab
SKINTIGHT® — SKINTIGHT® at SkinRev uses Alma PrimeX microplasma and UltraWave to resurface and tighten the surface layer. It can refresh texture without a medical procedure, but its action is shallower than a dermal laser, so lines, pores and stretch marks rooted in the dermis usually respond more to FSX. Read more
What to expect
Consultation, session
and aftercare
At consultation, Dr Sin Yong examines your skin type, the depth of lines or stretch marks, pore size and any active acne or redness. He explains which passes will be used and how FSX compares with fractional CO₂ or radiofrequency microneedling for your goals. Numbing cream is applied about 45 minutes before the session. A course is usually planned at consultation, with sessions spaced weeks apart to let collagen remodel between them.
During the session, you feel warm pulses as the handpiece moves across each area. Afterwards the skin is usually red and warm for a few hours. After stronger passes, small light scabs may form for several days; let them fall off naturally. Keep skincare gentle, use a broad-spectrum sunscreen every day, and pause exfoliating acids, scrubs and retinoids for about a week, or as advised.
Where this happens
Assessment and non-invasive care — SkinRev Lab, CityLink Mall #B1-28, 1 Raffles Link, Singapore 039393. Underground from City Hall MRT and Esplanade MRT; a short walk from Raffles Place, Marina Bay, Suntec and Bugis. Open daily 11am–8pm.
Medical treatment — IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, Singapore 228210, beside Orchard MRT (three stops from City Hall on the North-South line). Mon–Sat 11am–8pm, closed Sunday. Treatments are performed by Dr Sin Yong. WhatsApp +65 8815 3008.
Enquiries to SkinRev Lab about medical treatments are passed to IN Eternity Clinic, where Dr Sin Yong performs them.
Clinic page: FSX Laser at IN Eternity Clinic ↗
What the research says
The evidence,
with sources
Most published data on erbium-glass and thulium lasers come from non-ablative fractional systems at 1550 nm and 1927 nm, which use the same two wavelength classes as FSX. A 2025 review of a dual 1550 nm and 1927 nm system concluded that the erbium-glass wavelength effectively targets uneven pigment, fine lines and various scars, while thulium addresses pigment and sun damage, and that settings should be individualised by area and skin type. A 2026 review of 15 studies in skin of colour reported consistent improvement in scarring with the 1550 nm wavelength and in photoageing with 1927 nm, with lower energy and density linked to fewer cases of post-inflammatory hyperpigmentation.
For stretch marks, a network meta-analysis of randomised studies found that radiofrequency, ablative lasers, non-ablative lasers and intense pulsed light all reduced stretch mark width, with no single device clearly superior. That supports non-ablative laser as a reasonable option for stretch marks while setting realistic expectations: marks become less noticeable rather than disappearing. Because FSX is a clinic-specific protocol, these studies support its mechanism class rather than the protocol itself, and individual results vary.
References
- Friedman PM, Dover JS, Chapas A, et al. Current trends and future directions of the dual 1550-nm erbium glass fiber and 1927-nm thulium fiber non-ablative fractional laser system. Lasers Surg Med. 2025;57(7):561-570.
- Goldman MP, Wu DC, Khetarpal S, et al. Dual 1550-nm erbium glass fiber and 1927-nm thulium fiber non-ablative fractional laser system treatment in patients with skin of color: a review of clinical studies and unmet needs. Lasers Surg Med. 2026;58(3):169-179.
- Wu TJ, Huang YL, Kang YN, et al. Comparing energy-based devices for striae improvement: a systematic review and network meta-analysis of randomized controlled trials. Dermatol Surg. 2024;50(10):931-938.
Common questions
Your questions,
answered
How much does FSX laser in Singapore cost at IN Eternity Clinic?
Pricing is given at consultation at IN Eternity Clinic, because it depends on the areas treated, such as full face or a stretch-mark zone, and on how long a course your skin needs. When comparing options, consider total downtime and the number of sessions likely to be needed, not only the cost of one visit.
How is FSX different from fractional CO₂ laser?
Fractional CO₂ is ablative: it vaporises microscopic columns of skin, so it can produce bigger changes in deeper scars but usually means around a week of crusting. FSX is non-ablative and heats the dermis beneath an intact surface, so recovery is quicker and gentler, but change is more gradual. Deep acne scars usually need CO₂ or a combined scar plan; fine lines and pores often suit FSX.
Does FSX laser hurt?
Numbing cream is applied about 45 minutes beforehand, and most people describe the session as warm pulses with some prickling. Stronger passes, for example on stretch marks, can feel more intense. The doctor adjusts energy zone by zone, so tell him if any area feels too hot. Warmth and redness usually ease within a few hours.
Can FSX remove stretch marks?
It can make them less noticeable for many people, but no laser removes stretch marks completely. Studies show that several energy-based devices, including non-ablative lasers, reduce the width and improve the texture of stretch marks, with no single device clearly superior. Newer red marks often respond more than old silvery ones. A course is usually needed, and individual results vary.
How many sessions of FSX will I need?
FSX works by stimulating collagen, which builds over weeks, so a course is usually planned at consultation rather than a single session. Sessions are spaced weeks apart, and the number depends on what you are treating and how your skin responds. Many people then have occasional maintenance to keep collagen production going as skin continues to age.
Is FSX suitable for Asian skin?
Generally yes, with appropriate settings. Studies of erbium-glass and thulium lasers in skin of colour report improvements with a manageable risk of post-inflammatory hyperpigmentation, which falls when energy and density are lowered. Dr Sin Yong adjusts settings for your skin type, and daily sunscreen plus pausing strong actives around each session help lower the risk of darkening.
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