Pico laser is one of the most versatile technologies available in aesthetic medicine today — and also one of the most frequently misunderstood. Patients encounter the term across clinic websites, forums, and social media, often without a clear picture of what distinguishes pico laser from other laser types, or which specific concerns it is genuinely suited to address.
The answer lies in physics. Pico laser technology is defined not by a single wavelength, but by an ultra-short pulse duration — measured in picoseconds, or trillionths of a second. This characteristic fundamentally changes how the laser interacts with tissue, shifting the dominant mechanism from heat-based to pressure-based. The clinical implications of that shift are significant, and they explain why pico laser has become a preferred modality for pigmentation, acne scarring, and skin rejuvenation in Singapore's predominantly Asian population.
This article explains how pico laser works, what it treats, how different platforms compare, and what patients can realistically expect — so that when you consult with Dr Cherie Lau at Mirae, you are equipped to have a genuinely informed conversation.
What Is Pico Laser, and Why Does Pulse Duration Matter?
All lasers deliver energy to tissue. What varies — and what matters clinically — is how fast that energy is delivered. Pulse duration determines whether the dominant effect on the target is thermal (heat-based) or photoacoustic (pressure-based).
When a laser pulse is shorter than the thermal relaxation time of the target chromophore — the window within which the target would normally dissipate heat — the energy cannot escape as heat before the pulse ends. Instead, it creates a rapid pressure wave: a photoacoustic shockwave that mechanically shatters the target (pigment granules, ink particles) rather than burning it.
Why this matters for Asian skin: Singapore's population is predominantly Fitzpatrick phototype III–V — skin types that carry a higher baseline risk of post-inflammatory hyperpigmentation (PIH) following thermal injury. The photoacoustic mechanism of pico laser delivers less collateral heat to the surrounding dermis than older nanosecond lasers, reducing — though not eliminating — this risk. This is one reason pico laser has become the standard of care for pigmentation treatment in Asian aesthetic practice.
How Pico Laser Works: Photoacoustic vs Photothermal
Pico laser systems operate across multiple wavelengths, each with a different primary chromophore target. Most pico platforms offer two to three wavelengths, selected by the treating doctor based on the concern being addressed.
532nm (Green) — Superficial Pigmentation
Primary Target: Melanin (Superficial)The 532nm wavelength has a high affinity for melanin and is particularly effective for superficial epidermal pigmentation: sunspots, freckles, cafe-au-lait macules, and other discrete epidermal lesions. Because it is strongly absorbed by melanin at this wavelength, it is typically used at lower fluences with careful technique in patients with darker skin phototypes, where melanin concentration in the surrounding skin is higher and the risk of over-treatment is greater.
At 532nm, the photoacoustic mechanism fragments melanin granules into fine particles that are subsequently cleared by the lymphatic system, producing gradual lightening of the treated lesion over subsequent weeks.
1064nm (Nd:YAG) — Deeper Pigment, Skin Rejuvenation, Acne Scars
Primary Target: Melanin (Deep) & Dermal RemodellingThe 1064nm wavelength penetrates deeper into the dermis than 532nm, making it the workhorse wavelength for a broader range of applications: deeper pigmentation including dermal melasma components, acne scarring, enlarged pores, fine lines, and general skin rejuvenation. At 1064nm, melanin absorption is lower than at 532nm, making it the safer wavelength for treating darker skin tones.
When used in fractional mode — delivering energy through a diffractive lens array (DLAT/MLA handpiece) that creates multiple micro-columns of energy — the 1064nm wavelength generates a dermal remodelling response that is the basis for pico laser's efficacy in acne scar treatment.
785nm (Alexandrite) — Selective Pigmentation, Tattoo
Available on Select PlatformsA 785nm wavelength, available on certain pico platforms, provides an intermediate penetration depth and absorption profile that is particularly effective for blue-black tattoo ink and certain pigmentation types. It offers an additional tool in the treating doctor's armamentarium for cases where 532nm or 1064nm alone may not achieve optimal results.
Not all pico laser devices in Singapore offer this wavelength. Its availability depends on the specific platform used at the treating clinic.
What Conditions Does Pico Laser Treat?
Pico laser's versatility across wavelengths and modes means it addresses a wider range of concerns than most single-modality laser technologies. The following is a factual clinical overview.
Pigmentation
- Melasma — one of the most prevalent and challenging pigmentation conditions in Singapore; pico laser at 1064nm, used conservatively and in combination with appropriate topical management, is a recognised approach for mixed and dermal melasma components that are less responsive to topical treatment alone. Melasma requires careful, ongoing management and realistic expectations regarding recurrence.
- Solar lentigines (sunspots) — discrete hyperpigmentation from UV exposure; typically responds well to pico laser treatment at 532nm or 1064nm
- Freckles (ephelides) — superficial, UV-exacerbated pigmentation; often responds within one to two sessions at 532nm
- Post-inflammatory hyperpigmentation (PIH) — pigmentation following acne, inflammation, or trauma; pico laser can address the pigment component, though the underlying inflammatory cause must also be managed
- Hori's naevus — a dermal pigmented condition common in Asian women; requires a targeted approach given its dermal depth, and pico laser at 1064nm is a recognised treatment modality
Acne Scarring
Pico laser in fractional mode is one of the primary technologies used for atrophic acne scar treatment. This is discussed in detail in the dedicated section below.
Skin Rejuvenation and Texture
- Enlarged pores — pico laser at 1064nm in fractional mode stimulates collagen remodelling that contributes to pore size reduction over a treatment course
- Fine lines — superficial fine lines, particularly those with a textural component, may be improved through collagen stimulation
- Overall skin tone and clarity — the combination of pigment clearance and dermal remodelling produces a general improvement in skin luminosity that many patients notice as a "brightening" effect
Tattoo Removal
Pico laser is currently the most effective laser technology for tattoo removal, owing to its photoacoustic fragmentation of ink particles. Different ink colours respond to different wavelengths; a thorough assessment of the tattoo's colours, age, and depth is required before a removal plan is developed.
Pico Laser and Acne Scars: What the Evidence Shows
Acne scarring is one of the most common aesthetic concerns among patients in Singapore, and pico laser has emerged as an important modality in its management — particularly for atrophic (depressed) scar types. Understanding what pico laser can and cannot address requires understanding the different scar morphologies.
Narrow, deep, V-shaped channels extending into the deep dermis. The deepest and most difficult to treat. Pico laser contributes to remodelling but may need to be combined with subcision or TCA CROSS for optimal improvement.
Broader, U-shaped depressions with defined vertical walls. Respond well to pico laser in fractional mode, which promotes collagen infilling of the scar base. Moderate to good improvement is typically achievable over a treatment series.
Broad, wave-like depressions caused by fibrous bands tethering the skin. Subcision is often the primary treatment to release these bands; pico laser contributes to the collagen remodelling component and surface texture improvement.
Not true scarring but pigmentation remaining after acne resolves. Pico laser addresses this pigment component directly, often producing noticeable clearance within a series of sessions.
The mechanism by which pico laser addresses atrophic scars in fractional mode differs from its pigment-targeting applications. The diffractive lens array (DLAT) handpiece splits the laser beam into multiple micro-beams arranged in a grid pattern. Each micro-beam creates a localised zone of photoacoustic stress in the dermis without ablating the overlying epidermis — a phenomenon termed laser-induced optical breakdown (LIOB). The dermal LIOBs trigger a wound-healing cascade that includes new collagen synthesis, gradually elevating and remodelling the scar base over the weeks following each session.
Realistic expectations for acne scar treatment: Pico laser in fractional mode can produce meaningful improvement in acne scar texture and depth, but complete scar elimination is not a realistic goal with laser alone. Multiple sessions are required. Significant improvement typically becomes apparent after three to five sessions, with continued collagen remodelling occurring for months after each treatment. The degree of improvement varies by scar type, severity, and individual healing response.
For patients with mixed scar types or significant scar depth, a combination approach — incorporating subcision, CO₂ laser or Morpheus8 RF microneedling, alongside pico laser — often achieves superior outcomes to any single modality.
Acne scar treatment at Mirae begins with a thorough assessment by Dr Cherie Lau of scar types, distribution, and severity. This informs a structured treatment plan — which may incorporate pico laser, subcision, energy-based devices, or a combination — tailored to the individual patient's presentation and goals.
Pico Discovery and Other Pico Laser Platforms in Singapore
Pico laser is a category of technology, not a single device. Several platforms are in clinical use in Singapore, each with slightly different specifications. Patients frequently encounter brand names — Pico Discovery, PicoSure, EnlightenIII, PicoPlus — and are understandably uncertain about what the differences mean clinically.
Pico Discovery (Quanta System)
Available at MiraePico Discovery is characterised by ultra-short pulse durations, multiple available wavelengths (532nm and 1064nm), and a range of handpieces for different applications — including fractional handpieces for scar and rejuvenation indications. Its pulse duration and dual-wavelength configuration contribute to a strong photoacoustic effect and a well-documented safety profile for Asian skin types in published clinical literature.
Pico Discovery has a substantial body of published clinical evidence supporting its use across pigmentation, acne scarring, and tattoo removal indications — a consideration when evaluating platforms for clinical use.
Different clinics use different pico platforms, and while device specifications matter, they are one factor among several. The treating doctor's clinical assessment, technique, parameter selection, and understanding of individual skin behaviour are equally — if not more — important determinants of treatment outcome.
Pico Laser vs CO₂ Laser vs Yellow Laser: A Comparative Overview
Patients commonly ask how pico laser compares to other laser technologies they have encountered. The following table provides a factual clinical reference.
| Feature | Pico Laser | Fractional CO₂ Laser | Yellow Laser (585nm) |
|---|---|---|---|
| Primary mechanism | Photoacoustic (pressure-based) fragmentation of chromophores; dermal remodelling via LIOB in fractional mode | Ablative and coagulative thermal remodelling of tissue via water absorption | Selective photothermolysis of oxyhaemoglobin; melanin absorption |
| Primary tissue target | Melanin; dermal collagen (fractional mode); tattoo ink | Water within tissue (ablation + coagulation) | Oxyhaemoglobin; superficial melanin |
| Pigmentation treatment | Yes — broad range including melasma, PIH, sunspots, Hori's naevus | Limited — not a primary indication | Yes — superficial epidermal pigmentation; sunspots, freckles, PIH |
| Acne scar treatment | Yes — atrophic scars via fractional mode (LIOB-based dermal remodelling) | Yes — strong evidence for atrophic scars; ablative resurfacing | Limited — PIH component only; not structural remodelling |
| Vascular / redness treatment | Limited | No | Yes — primary indication; rosacea, telangiectasias, facial redness |
| Skin rejuvenation | Yes — pores, fine lines, texture, skin tone | Yes — strongest resurfacing effect of the three | Yes — skin clarity and brightness as secondary benefit |
| Downtime | Minimal — mild redness resolving within hours to one day | Moderate to significant — 5–14 days depending on intensity | Minimal — mild redness, hours to one day |
| Asian skin safety profile | Favourable — photoacoustic mechanism reduces thermal injury to surrounding tissue | Requires careful parameter selection; PIH risk exists | Favourable — 585nm well-tolerated in Fitzpatrick III–IV |
| Tattoo removal | Yes — most effective current technology | No | No |
| Combination use | Frequently combined with yellow laser, CO₂ laser, subcision, or injectables | May be combined with pico laser or subcision in scar protocols | Frequently combined with pico laser for comprehensive pigmentation and vascular management |
This table is a general clinical reference only. Individual treatment decisions depend on a thorough in-person assessment by a qualified doctor and cannot be determined from this table alone.
What to Expect: Sessions, Downtime & Results
The Treatment Experience
Pico laser treatment at Mirae is performed by Dr Cherie Lau. A topical numbing cream is applied prior to treatment and left on for 20–30 minutes. The laser handpiece is passed systematically over the treatment area, with the operator selecting the appropriate wavelength, fluence, and handpiece for each zone of the face and the specific concern being treated.
Patients typically describe the sensation as a series of rapid snapping or prickling sensations. A full-face treatment session typically takes 20–45 minutes. No incisions are made and no wound care is required.
Immediate Post-Treatment Response
Mild redness and a sensation of warmth are typical immediately following treatment. Treated pigmented lesions may darken transiently — a normal part of the clearance process — before flaking away over the following days. The skin should not be picked or scrubbed during this period.
For fractional treatments targeting acne scarring, patients may experience pinpoint bleeding at treatment sites and slightly more prolonged redness — typically resolving within one to two days. Overall, pico laser is considered a low-downtime treatment relative to the degree of clinical improvement achievable.
Post-treatment care essentials: Broad-spectrum SPF 50 sunscreen is non-negotiable following pico laser treatment and should be applied daily throughout the treatment course and beyond. Sun exposure during the post-treatment period risks re-triggering the pigmentation processes the laser is working to address, and can reduce treatment efficacy. Dr Cherie Lau will advise on a complete post-treatment care protocol at the time of treatment.
How Many Sessions Are Needed?
- General skin brightening and mild pigmentation: Three to five sessions typically produces meaningful, visible improvement
- Melasma: Ongoing management rather than a finite course — melasma is a chronic condition that requires maintenance treatment alongside topical management and strict sun protection
- Acne scarring: Five to eight sessions is a general reference range; significant improvement continues to develop for months following each session as collagen remodelling progresses
- Tattoo removal: Highly variable — determined by ink colours, density, age, and location; a removal assessment is required to provide a session estimate
When Will Results Be Visible?
Pigmentation clearance is often noticeable within two to four weeks of each session, as cleared pigment particles are removed by the lymphatic system. Structural improvements from fractional treatments — scar depth reduction, pore refinement, collagen remodelling — develop more gradually, with the full benefit of each session becoming apparent over eight to twelve weeks. This means the cumulative results of a full treatment course are assessed at three to four months after the final session.
Who Is Pico Laser Suitable For?
Pico laser may be considered for patients presenting with one or more of the following:
- Pigmentation — melasma, sunspots, freckles, PIH, Hori's naevus, uneven skin tone
- Atrophic acne scarring — ice pick, boxcar, or rolling scars
- Enlarged pores, surface textural irregularities, or fine lines
- Dull skin tone and reduced clarity
- Unwanted tattoos
Factors That Affect Suitability
- Active acne: Active inflammatory acne should be adequately controlled before undertaking laser treatment for acne scarring, as active breakouts can compromise healing and produce new PIH
- Isotretinoin use: Patients currently taking or recently completing isotretinoin (Accutane) may require a treatment interval before laser treatment; Dr Cherie Lau will advise on the appropriate timing
- Photosensitising medications: Certain antibiotics, NSAIDs, and other medications can increase sensitivity to laser energy; a full medication review is part of the consultation
- Recent sun exposure or tanning: Recent tanning increases melanin in the surrounding skin, altering laser absorption dynamics and increasing the risk of adverse effects; treatment is typically deferred until the tan has faded
- Pregnancy and breastfeeding: Laser treatment is generally deferred
- Active skin infections or open lesions: Treatment is deferred until resolved
Suitability for pico laser treatment is determined by Dr Cherie Lau during an in-person consultation. This assessment includes a detailed review of skin concerns, medical and medication history, and current skin condition — all of which inform the treatment plan and parameter selection. No laser treatment is recommended without this assessment.
Questions to Ask During Your Consultation
A well-conducted consultation for pico laser treatment should cover the following:
- 1. What is the primary concern — pigmentation, scarring, or a combination? How is each component addressed?
- 2. Is pico laser the most appropriate modality for this concern, or would a combination approach — with yellow laser, CO₂ laser, Morpheus8, or subcision — be more effective?
- 3. Which wavelength and handpiece is most appropriate for my skin type and concern?
- 4. What is my baseline PIH risk, and how does that affect the treatment protocol?
- 5. What is a realistic number of sessions and timeline to see meaningful improvement?
- 6. What post-treatment care and sun protection protocol is required?
- 7. Are there any medications or supplements I need to pause before treatment?
- 8. If treating melasma: what is the ongoing management plan, including maintenance treatments and topical therapy?
Key Takeaway
Pico laser is a genuinely versatile technology — effective across pigmentation, acne scarring, skin rejuvenation, and tattoo removal — because its photoacoustic mechanism works differently from older laser types. Whether it is the right choice for your specific concern, how many sessions you realistically need, and whether a combination approach will deliver better results are clinical questions that require an in-person assessment with Dr Cherie Lau at Mirae Medical Aesthetics.
Medical Disclaimer: This article is intended for general educational purposes only. It does not constitute medical advice, a diagnosis, or a recommendation for any specific treatment. The information provided reflects general clinical knowledge and is not a substitute for an in-person consultation with a licensed aesthetic doctor. Individual suitability for any treatment can only be determined following a thorough assessment of each patient's skin concerns, medical history, and clinical presentation. Results from any aesthetic treatment vary between individuals and cannot be guaranteed. Please consult a qualified and licensed medical professional before proceeding with any aesthetic procedure.
Device note: Pico Discovery is a registered trademark of Quanta System. References to specific devices in this article are for informational and clinical context only. All laser treatments at Mirae are performed or directly supervised by Dr Cherie Lau. Availability of specific devices and wavelengths is subject to change; please confirm with the clinic at the time of consultation.