Pico Laser Treatment Guide: Comprehensive Clinical Applications for 9 Common Pigmentary Disorders

2026-06-30

Introduction
Pico laser technology represents one of the most significant advances in aesthetic dermatology over the past decade. Unlike traditional Q‑switched nanosecond lasers that rely primarily on photothermal effects, picosecond lasers deliver energy in ultra‑short pulses measured in trillionths of a second, generating a powerful photoacoustic (photomechanical) effect that shatters pigment particles into microscopic fragments with minimal thermal damage to surrounding tissue.
This fundamental difference translates into several clinical advantages: fewer treatment sessions, lower risk of post‑inflammatory hyperpigmentation (PIH), shorter recovery times, and broader applicability across Fitzpatrick skin types I–VI.
The global picosecond laser market has experienced rapid growth, driven by increasing demand for non‑invasive aesthetic treatments and the expanding range of clinical indications. From tattoo removal and benign pigmented lesions to acne scars and skin rejuvenation, picosecond lasers have become indispensable tools in modern dermatology and aesthetic medicine.
This comprehensive guide covers nine common pigmentary disorders and their picosecond laser treatment protocols, supported by clinical evidence and practical parameter recommendations.

1. Nevus of Ota
Clinical Overview
Nevus of Ota is a dermal melanocytic condition characterized by blue‑gray pigmentation in the distribution of the ophthalmic and maxillary branches of the trigeminal nerve. It is more prevalent in Asian populations and can significantly impact patients' quality of life. Traditional Q‑switched nanosecond lasers have shown satisfactory results, but picosecond lasers offer shorter treatment cycles and fewer sessions.
Treatment Protocol
Both the 755nm alexandrite picosecond laser and the 1064nm Nd:YAG picosecond laser are recommended for treating nevus of Ota. A retrospective study of 1064nm picosecond laser treatment demonstrated significant improvement after three sessions, with only one patient experiencing hyperpigmentation. Other studies using 755nm picosecond lasers reported complete lesion clearance after one to two treatments in some cases, with an average total treatment time of approximately 10 months.
Key Parameters

Parameter	Recommendation
Wavelength	755nm or 1064nm
Spot size	2.5–5 mm
Energy density	2.83–4.07 J/cm² (high energy) or 1.02–1.26 J/cm² (low energy)
Endpoint	Moderate frost (high energy) or erythema without petechiae (low energy)
Treatment interval	3–6 months

Special Considerations
Children typically require fewer sessions than adults to achieve clearance. For Hori's nevus (acquired bilateral nevus of Ota‑like macules), the risk of PIH is higher, so treatment intervals should be extended accordingly. Research has confirmed that alexandrite picosecond lasers achieve higher single‑session clearance rates than Q‑switched nanosecond lasers.
2. Café‑au‑Lait Macules
Clinical Overview
Café‑au‑lait macules are benign pigmented lesions present at birth, commonly referred to as birthmarks. They appear as light brown patches ranging from a few millimeters to several centimeters in diameter. According to the Guidelines for the Diagnosis and Treatment of Common Diseases Related to Laser Cosmetic Treatments, the overall effective rate for treating café‑au‑lait macules ranges from 20% to 74.4%, depending on the modality used.
Treatment Protocol
High‑energy nanosecond lasers (wavelengths 532nm, 694nm, 755nm) and picosecond lasers (532nm and 755nm) are considered first‑line treatment options. The 1064nm picosecond laser with large spot size and low energy is increasingly becoming an important treatment choice for café‑au‑lait macules in infants, children, and refractory cases, due to its advantages of virtually no downtime, minimal pain, and low PIH risk.
Key Parameters

Parameter	Recommendation
Wavelength	532nm, 755nm, or 1064nm (based on lesion depth and color)
Spot size	Larger for deeper lesions
Energy density	Low to moderate
Endpoint	Mild white frosting
Treatment interval	4–8 weeks

Special Considerations
Efficacy varies significantly among patients; some show dramatic improvement while others experience higher recurrence rates. Multiple sessions (1–6+) may be required. Since different patients may have markedly different responses to lasers, it is recommended to conduct test treatments on a small localized area before treating larger lesions to determine the optimal laser and energy level for each individual.

3. Melasma
Clinical Overview
Melasma is the most common type of yellowish‑brown pigmentation on the faces of Asian women. Due to its complex pathogenesis—involving genetic predisposition, hormonal influences, and UV exposure—melasma remains one of the most difficult‑to‑cure pigmentary diseases worldwide. Even with a variety of treatment options, melasma still carries a certain recurrence rate and adverse reaction rate after laser treatment.
Active vs. Stable Phase

Active phase: Recent expansion of lesion area, darkening of color, redness of lesions, redness after scratching, and fading on glass slide pressure
Stable phase: No recent expansion, no color darkening, no redness after scratching, and no fading on glass slide pressure

During the active phase, high‑energy laser/microcurrent treatments and high‑concentration chemical peels should be avoided. Gentle treatment plans should be chosen, combined with systemic drug therapy and adjuvant therapies. During the stable phase, treatment should also be gradual to avoid irritating melanocytes, aggravating the inflammatory response, and damaging the skin barrier.
Treatment Protocol
For picosecond laser treatment of melasma, parameters should be set with gentle intensity. The initial energy should not be too high, the treatment interval should not be too short, and the treatment endpoint should be a mild flushing reaction. Phototherapy is generally not recommended as a first‑line treatment for melasma, and single, repeated phototherapy treatments carry the risk of hyperpigmentation, hypopigmentation, or depigmentation.
Key Parameters

Parameter	Recommendation
Wavelength	1064nm (preferred), 755nm, or 730nm
Energy density	Low, conservative settings
Spot size	Larger (4.5–5 mm)
Endpoint	Mild erythema only
Treatment interval	4–6 weeks or longer
Number of sessions	3–6+

Special Considerations
Combination therapy with topical tyrosinase inhibitors (hydroquinone, tranexamic acid, kojic acid) and strict sun protection (SPF 50+) is essential for maintaining results and preventing recurrence. Individual patient differences must guide the selection of laser/phototherapy techniques and treatment parameters.
4. Freckles (Ephelides) and Solar Lentigines
Clinical Overview
Freckles and solar lentigines are the most common epidermal pigmentation disorders encountered in clinical practice. Freckles are genetically determined and exacerbated by sun exposure, while solar lentigines (age spots) result from cumulative photodamage over time.
Treatment Protocol
The 532nm Nd:YAG picosecond laser and 755nm alexandrite picosecond laser are both recommended for treating freckles and solar lentigines. For Fitzpatrick skin types I–IV with clearly demarcated lesions and good contrast with normal skin, results are excellent. Patients with lighter lesions or concurrent melasma have higher PIH risk.
Key Parameters

Parameter	Recommendation
Wavelength	532nm (lighter lesions) or 755nm (darker skin)
Energy density	0.6–1.4 J/cm² (532nm) or 4.07 J/cm² (755nm)
Spot size	2.5–6 mm
Endpoint	Mild white frosting
Treatment interval	4–6 weeks
Number of sessions	1–3

Special Considerations
One session may achieve significant clearance, but 1–3 sessions are typically recommended for optimal results. Results are excellent with low recurrence when sun protection is maintained.

5. Hori‘s Nevus (Acquired Bilateral Nevus of Ota‑like Macules)
Clinical Overview
Hori’s nevus is a relatively common dermal pigmentation disorder in Asian populations, frequently misdiagnosed as melasma. It presents as bilateral, symmetric, blue‑gray or brown macules on the cheekbones, temples, and eyelids.
Treatment Protocol
The 755nm alexandrite picosecond laser and 1064nm Nd:YAG picosecond laser are both effective. The 755nm wavelength is highlighted for its efficacy in Hori’s nevus, while 1064nm provides deep penetration for dermal melanocytes.
Key Parameters

Parameter	Recommendation
Wavelength	755nm or 1064nm
Spot size	2.5–3 mm (high energy) or 4.5–5 mm (low energy)
Energy density	2.83–4.07 J/cm² (high) or 1.02–1.26 J/cm² (low)
Endpoint	Moderate frost or erythema without petechiae
Treatment interval	3–6 months
Number of sessions	5–10+

Special Considerations
PIH risk is higher in Hori‘s nevus, so treatment intervals should be extended accordingly. Generally requires multiple sessions to achieve clearance.
6. Tattoo Removal
Clinical Overview
Tattoo removal remains one of the most well‑established and evidence‑based indications for picosecond laser technology. Picosecond lasers achieve superior ink fragmentation compared to Q‑switched nanosecond lasers due to their ultra‑short pulse duration and powerful photoacoustic effect.
Treatment Protocol
Different ink colors require different wavelengths:

532nm: Red, orange, yellow inks
730nm: Green, blue inks
755nm: Black, blue, green inks (PicoSure)
1064nm: Black, dark blue, dark green inks (especially for darker skin types)

Key Parameters

Parameter	Recommendation
Wavelength	Based on ink color (532nm/730nm/755nm/1064nm)
Energy density	Varies by ink density and depth
Treatment interval	6–8 weeks
Number of sessions	Amateur: 3–5; Professional: 5–10+; Multicolor: 10+

Special Considerations
Amateur tattoos typically clear in fewer sessions (3–5) than professional tattoos (5–10+). Multicolor tattoos often require a combination of wavelengths. Picosecond laser technology has revolutionized tattoo removal by offering faster clearance rates, fewer side effects, and superior outcomes compared to nanosecond lasers.

7. Acne Scars (Atrophic Scarring)
Clinical Overview
Acne scarring, particularly atrophic scarring (ice‑pick, boxcar, and rolling types), represents a significant aesthetic concern affecting patients’ quality of life. Fractional picosecond lasers have emerged as an effective treatment modality with a favorable safety profile and shorter recovery times compared to traditional ablative fractional lasers.
Treatment Protocol
The 755nm picosecond laser with diffractive lens array and 1064nm picosecond laser with fractional handpieces are both effective. Fractional picosecond lasers create microscopic treatment zones (MTZs) in the dermis, stimulating collagen remodeling without damaging the epidermis.
Key Parameters

Parameter	Recommendation
Wavelength	755nm or 1064nm
Mode	Fractional (with diffractive lens or fractional handpiece)
Treatment interval	4–6 weeks
Number of sessions	3–6+

Special Considerations
Clinical improvement is typically observed after 3–5 sessions, with continued improvement up to 6 months post‑treatment. Fractional picosecond lasers are particularly advantageous for darker skin types (Fitzpatrick III–VI) due to the lower risk of PIH compared to ablative fractional CO2 lasers.
8. Skin Rejuvenation and Photoaging
Clinical Overview
Skin rejuvenation, including improvement of fine lines, wrinkles, skin texture, and overall complexion, is one of the most sought‑after aesthetic treatments. Picosecond lasers, particularly when used with fractional focusing lenses, induce laser‑induced optical breakdown (LIOB) and subsequent collagen and elastin neogenesis.
Treatment Protocol
Both the 755nm picosecond laser with diffractive lens array and the 1064nm picosecond laser with fractional handpieces are effective for skin rejuvenation.
Key Parameters

Parameter	Recommendation
Wavelength	755nm or 1064nm
Mode	Fractional
Energy density	Low, multiple passes
Endpoint	Mild erythema
Treatment interval	3–4 weeks
Number of sessions	3–5

Special Considerations
Results develop gradually over several weeks as collagen remodeling progresses. Combination therapy with other modalities such as radiofrequency or microneedling may enhance outcomes.

9. Other Pigmentary Disorders
Clinical Overview
Picosecond lasers have demonstrated efficacy in treating a range of other pigmentary disorders, including post‑inflammatory hyperpigmentation (PIH), drug‑induced hyperpigmentation, lichen planus pigmentosus (LPP), and periorbital hyperpigmentation (dark circles).
Key Applications

PIH: The 1064nm picosecond laser has been shown to effectively treat PIH in Asian patients with no remarkable side effects or recurrence.
Drug‑induced hyperpigmentation: Case reports have demonstrated 85% resolution of hydroxychloroquine‑induced hyperpigmentation after a single treatment with 532nm picosecond laser.
Lichen planus pigmentosus (LPP): Picosecond Nd:YAG lasers have shown effectiveness for LPP in patients with pigmented skin.
Periorbital hyperpigmentation (dark circles): The 1064nm picosecond laser has been used effectively with minimal discomfort and no downtime.

Key Parameters

Parameter	Recommendation
Wavelength	532nm, 755nm, or 1064nm (based on lesion characteristics)
Energy density	Conservative, low to moderate
Spot size	Larger to minimize epidermal injury
Treatment interval	4–6 weeks
Number of sessions	3–5+

Special Considerations
For all pigmentary disorders, a thorough patient assessment is essential. Test patching is recommended to assess individual response and minimize adverse effects. Strict sun protection and the use of tyrosinase inhibitors are essential for maintaining treatment outcomes and preventing recurrence.
Understanding Pico Laser Technology: Key Product Knowledge
What Is a Pico Laser?
A picosecond is a unit of time equal to one trillionth of a second (10⁻¹² seconds). Pico lasers emit pulses at this ultra‑short duration, generating extremely high peak power instantaneously. The mechanism of action is primarily photoacoustic (photomechanical) rather than photothermal. This means pigment particles are shattered by mechanical shockwaves rather than burned by heat, resulting in less thermal damage to surrounding tissue and a lower risk of side effects.
PicoSure vs. PicoWay: Understanding the Difference

Feature	PicoSure	PicoWay (Ultra Pico)
Manufacturer	Cynosure	Candela (formerly Syneron)
Wavelengths	755nm (primary) + optional 532nm	532nm, 730nm, 785nm, 1064nm
Minimum pulse width	750ps (550ps with Boost)	300ps
Classification	Picosecond (sub‑nanosecond)	True ultra‑picosecond
Key technology	Diffractive lens array	Holographic diffractive lens array

PicoWay is considered a true “ultra‑picosecond” laser with a minimum pulse width of 300ps, while PicoSure operates at 750ps (550ps with Boost technology). The shorter the pulse width, the higher the peak power and the more efficient the pigment fragmentation. PicoWay also offers more wavelength options (532nm, 730nm, 785nm, 1064nm), providing greater flexibility for treating different pigment types and skin tones.
Wavelength Selection Guide

Wavelength	Target	Best For
532nm	Superficial melanin	Freckles, solar lentigines, red/yellow tattoos
730nm	Intermediate depth	Green/blue tattoos, some pigmentary disorders
755nm	Superficial to mid‑depth melanin	Freckles, solar lentigines, nevus of Ota, black/blue/green tattoos
1064nm	Deep melanin	Melasma, nevus of Ota, Hori‘s nevus, dark skin types, deep tattoos

Factors Affecting Treatment Outcomes

Pulse width: Shorter pulse widths generate higher peak power and more efficient pigment fragmentation
Wavelength selection: Must match the target chromophore‘s absorption spectrum
Energy density (fluence): Higher energy generally means better clearance but higher side effect risk
Spot size: Larger spot sizes penetrate deeper but may require higher energy
Skin type (Fitzpatrick): Darker skin types require more conservative settings to minimize PIH risk
Lesion characteristics: Depth, color, and density of pigment all affect treatment parameters

Clinical Summary: Indications and Treatment Overview

Indication	Recommended Wavelength	Typical Sessions	Interval	Special Considerations
Nevus of Ota	755nm, 1064nm	3–8	3–6 months	Children need fewer sessions; higher PIH risk in Hori‘s nevus
Café‑au‑lait macules	532nm, 755nm, 1064nm	3–10+	4–8 weeks	Variable response; test patch recommended
Melasma	1064nm (preferred)	3–6+	4–6 weeks	Active phase: avoid high energy; combine with topical therapy
Freckles / Solar lentigines	532nm, 755nm	1–3	4–6 weeks	Excellent results; low recurrence with sun protection
Hori‘s nevus	755nm, 1064nm	5–10+	3–6 months	Higher PIH risk; extend intervals
Tattoo removal	532nm/730nm/755nm/1064nm	3–10+	6–8 weeks	Color‑specific wavelength selection
Acne scars	755nm, 1064nm (fractional)	3–6+	4–6 weeks	Good for darker skin types; lower PIH risk
Skin rejuvenation	755nm, 1064nm	3–5	3–4 weeks	Gradual results over several months
Other pigmentary disorders	532nm, 755nm, 1064nm	3–5+	4–6 weeks	Test patch recommended; conservative settings

Ready to Add Pico Laser to Your Clinic?
Pico laser technology represents one of the fastest‑growing segments in aesthetic medicine. With expanding clinical indications—from tattoo removal and pigmentary disorders to acne scars and skin rejuvenation—investing in a high‑quality pico laser system can significantly expand your clinic‘s service offerings and revenue potential.
Why choose our pico laser systems?

Multi‑wavelength capability – 532nm, 730nm, 755nm, and 1064nm options for comprehensive treatment coverage
True ultra‑picosecond technology – Pulse widths as short as 300ps for superior pigment fragmentation
Fractional handpieces – For acne scar revision and skin rejuvenation
CE & ISO certified – Quality assured for professional clinical use
Factory‑direct pricing – Competitive wholesale rates for clinics and distributors
OEM/ODM customization – Branding options for distributors
Comprehensive training & support – Technical training, treatment protocols, and after‑sales service

Contact us today on WhatsApp: +86 19937136112
Our team is ready to answer your questions, provide product recommendations, and offer a customized quote based on your business needs. Let us help you bring advanced pico laser technology to your market.