Head-to-head comparison · 2026 Singapore prices

Q-Switch vs Pico Laser

/ˈkjuː swɪtʃ/ vs /ˈpiːkəʊ ˈleɪzə/ Two pigment lasers for brown under-eye circles: nanosecond pulses against picosecond pulses

Dr Joy Koh, Editor-in-ChiefWritten by Dr Joy Koh, MBBS, Editor-in-Chief · Updated

Independent review: evidence graded A to D, 2026 Singapore prices from published clinic lists, sources listed at the end of the page.

Q-switch vs pico laser: pigmented dark circle laser comparison of pulse, evidence grade and 2026 Singapore price

Overview

Q-switch and pico lasers both fragment brown pigment and differ in the length of the pulse. A Q-switched laser fires in nanoseconds (billionths of a second), whereas a pico laser fires in picoseconds, about a thousand times shorter, and breaks pigment more by pressure than by heat. Pigment lasers as a group carry Grade B evidence for brown, pigmented dark circles, but the under-eye studies of each laser are small, and no trial has compared the two in that area (Grade D). Across 20 randomised trials in other pigment disorders, pico and Q-switch cleared pigment at similar rates, and pico caused less pain and less post-inflammatory darkening, although some individual trials favoured Q-switch. Frequent low-energy Q-switch "toning" has caused confetti-like white spots in Singapore patients. In Singapore in 2026, a Q-switch session costs S$180 to 400 and an under-eye pico session S$250 to 800, with 4 to 10 sessions for either.

  • Both lasers target brown pigment, with pico pulses about a thousand times shorter
  • Grade B for pigment lasers on brown circles, with no under-eye trial comparing the two (Grade D)
  • Similar clearance in other pigment conditions, with less pain and darkening on average after pico
  • Frequent Q-switch toning can leave white spots (hypopigmentation)
  • Q-switch S$180 to 400 a session, pico S$250 to 800 under the eyes
  • Neither treats blue vessels or a shadow from a hollow or bag
Introduction

Q-switch and pico lasers are the two pigment lasers used in Singapore clinics for brown dark circles, and pico is usually marketed as the newer and superior option. Their mechanisms, head-to-head trial results, risks in Asian skin and 2026 prices are compared below.

Q-switch vs pico laser at a glance

Q-switch laser Pico laser
Pulse length Nanoseconds (about 5 to 50 ns) Picoseconds (about 300 to 750 ps)
How it breaks pigment Mainly heat (photothermal) Mainly pressure (photoacoustic), with less heat
Common wavelengths 1064 nm, 532 nm, 694 nm (ruby), 755 nm 755 nm, 1064 nm, 532 nm
Under-eye method Low-energy “toning” or fractional settings Low-energy toning or fractional (lens-array) settings
Evidence for brown dark circles B for pigment lasers as a group, Q-switch studies small B for pigment lasers as a group, pico studies small and mixed
Head to head under the eye D (no study) D (no study)
2026 Singapore price S$180 to 400 a session (packages from about S$200 a session) S$250 to 800 per under-eye session
Usual course 4 to 10 sessions, 1 to 4 weeks apart 4 to 8 sessions, about 4 weeks apart
Main risks Post-inflammatory darkening, white spots after frequent toning Post-inflammatory darkening, rare white spots

How Q-switch and pico lasers work on dark circles

  • Q-switch laser A nanosecond pulse heats pigment granules faster than the heat can dissipate into the surrounding tissue, so the granules fragment and are cleared by scavenger cells (macrophages) over the following weeks. At low “toning” energy, the 1064 nm Q-switch damages the pigment granules inside the pigment cells without destroying the cells. Each toning session therefore clears only part of the pigment, and a course requires many sessions.
  • Pico laser A picosecond pulse is so short that pigment is fragmented mainly by a pressure wave rather than by heat, which leaves less heat in the surrounding skin to provoke post-inflammatory darkening. With a fractional lens array, the laser also creates tiny cavities in the upper skin, which are shed over 3 to 4 weeks.

Both lasers treat only brown pigment, because their short pulses are designed to fragment melanin granules, not to close blood vessels or restore volume. Blue vascular circles and shadows from a hollow or bag require other treatments, and the types are explained on Dark eye circles.

Q-switch vs pico laser evidence for pigmented dark circles

  • EvidenceEvidence for Q-switch under the eyes. In a before-and-after study of 28 patients, six fractional 1064 nm Q-switch sessions two weeks apart reduced the melanin index, a measure of skin pigment, by 22% at three months. In a randomised trial of 28 patients, fractional Q-switch 1064 nm improved the circles, but carbon dioxide gas injections (carboxytherapy) produced greater improvement. Small series of Q-switched ruby laser, with 18 to 30 patients each, report good or excellent results in most patients.
  • EvidenceEvidence for pico under the eyes. In two device-funded open-label studies, 10 patients given three 755 nm pico sessions had improved by 132 days, whereas 19 given a single 1064/532 nm session showed no improvement. In a split-face study of 12 women, 532 nm pico caused post-inflammatory darkening more often than lightening.
  • Head to head in other pigment conditions A 2025 meta-analysis of 20 randomised trials and one retrospective study (971 patients) found similar clearance of skin pigment with pico and Q-switch, with less pain, less darkening and less white spotting after pico. Results vary by condition. In a split-face trial of 30 patients with Hori’s naevus, a dermal pigment common in Asian women that can mimic dark circles, pico cleared more pigment and caused darkening in 28% of sides, against 54% with Q-switch. In melasma and freckles, by contrast, some trials favoured Q-switch or found no difference.

The site grade for pigment lasers on brown circles remains B, the same grade given on Dark eye circles treatment in Singapore.

Q-switch vs pico laser price in Singapore (2026)

Laser Per session Usual course Course total
Q-switch laser S$180 to 400 (trial offers from S$68) 4 to 10 sessions S$720 to 4,000, with 10-session packages about S$2,000
Pico laser (under-eye) S$250 to 800 (trial offers from S$80) 4 to 8 sessions S$1,000 to 6,400

Low headline prices are usually first-trial offers. A quote should state the device, the treatment area and whether Goods and Services Tax (GST) is included. No Singapore clinic publishes a separate under-eye price for Q-switch, so the Q-switch figures are general session prices rather than under-eye prices.

Q-switch vs pico laser side effects in Asian skin

  • Post-inflammatory darkening Darkening is the main risk of both lasers in Asian skin, because laser-induced inflammation stimulates the more reactive pigment cells of darker skin to produce new pigment. The risk rises with high energy, frequent sessions or sun exposure.
  • White spots after Q-switch toning In a Singapore General Hospital series, all 23 patients treated with 1064 nm Q-switch three times a week for two months developed confetti-like white spots, and none of the 13 followed for four months had recovered. The National Skin Centre reported similar cases, and a cohort of 147 patients found white spots in 2%. Repeated low-energy pulses are thought to destroy pigment cells cumulatively, so wider spacing between sessions and a limited total number reduce the risk.
  • White spots after pico White spots were reported in 3 of 796 patients (0.4%) in one series.
  • Eye injury Both lasers can injure the eye if it is not shielded, and a corneal burn has been reported during pico treatment of the eyelid. Metal eye shields are standard for under-eye treatment, and in Singapore these class 4 lasers may be operated only by registered medical practitioners.

Which needs fewer sessions, Q-switch or pico?

For dermal pigment such as Hori’s naevus and naevus of Ota, pico reached an excellent result in fewer sessions in small trials (4.2 against 5.4 sessions in one study of 10 patients). For brown dark circles, no study has compared the number of sessions each laser requires. Q-switch toning protocols use more sessions at shorter intervals, whereas pico protocols use fewer sessions at monthly intervals. With either laser, pigment returns without daily sunscreen, because ultraviolet light continues to stimulate the pigment cells that remain.

Q-switch or pico laser, which to choose for each type of dark circle

  • Brown, flat pigment under the eyes Sunscreen and a lightening cream come first, followed by either laser. Pico carries the lower average risk of darkening and white spots, and Q-switch the lower price.
  • Grey-brown patches (possible Hori naevus) A medical diagnosis is required first, because Hori’s naevus lies deeper in the dermis than ordinary under-eye pigment. Pico has the better trial data for this condition.
  • History of white spots or many previous toning sessions Further frequent Q-switch toning should be avoided, because it adds to the cumulative risk of white spots.
  • Blue or purple circles, or a shadow Neither laser is suitable. Vascular circles are compared on Yellow laser vs Pico laser, and hollows on Sunken eyes treatment.

Frequently asked questions about Q-switch and pico laser

Is pico laser better than Q-switch for dark circles?


No study has compared them under the eyes. In other pigment conditions they clear pigment at similar rates, and pico causes less pain and post-inflammatory darkening on average, although at a higher price per session.

Can Q-switch laser cause white spots?


Q-switch laser can cause white spots. Frequent low-energy toning has caused confetti-like spots, including in a Singapore hospital series, and the risk rises with the number and frequency of sessions.

How many sessions of Q-switch or pico laser are needed for dark circles?


Q-switch protocols in studies used 4 to 10 sessions one to four weeks apart, and pico protocols 4 to 8 sessions about a month apart. Pigment can return without daily sunscreen.

How much does Q-switch laser cost in Singapore?


A Q-switch session costs S$180 to 400 in Singapore in 2026, with first-trial offers from S$68 and 10-session packages at about S$2,000. An under-eye pico session costs S$250 to 800.

Does Q-switch or pico laser help blue dark circles?


Neither laser improves blue dark circles. Both target brown pigment, so they do not change blue or purple vessels or a shadow from a hollow.

General information, not medical advice. A registered medical practitioner should be consulted before any treatment. Dark Eye Circles Singapore does not sell treatments.

Sources and price references (checked 8 October 2026)
  1. Alavi S, et al. Evaluation of Efficacy and Safety of Low-Fluence Q-Switched 1064-nm Laser in Infra-orbital Hyperpigmentation Based on Biometric Parameters. J Lasers Med Sci. 2022;13:e16. doi:10.34172/jlms.2022.16 (PMID 35996487) — 28 completed, 6 sessions; melanin index −22% https://doi.org/10.34172/jlms.2022.16
  2. Nilforoushzadeh MA, et al. Comparison of carboxy therapy and fractional Q-switched ND:YAG laser on periorbital dark circles treatment: a clinical trial. Lasers Med Sci. 2021;36(9):1927–1934. doi:10.1007/s10103-021-03274-5 (PMID 33638096) — Randomised, 28 patients; carboxytherapy better than fractional Q-switch 1064 nm https://doi.org/10.1007/s10103-021-03274-5
  3. Momosawa A, et al. Combined therapy using Q-switched ruby laser and bleaching treatment with tretinoin and hydroquinone for periorbital skin hyperpigmentation in Asians. Plast Reconstr Surg. 2008;121(1):282–288. doi:10.1097/01.prs.0000293869.00522.ec (PMID 18176232) — Q-switched ruby plus topical bleaching, 18 patients https://doi.org/10.1097/01.prs.0000293869.00522.ec
  4. Xu TH, et al. Treatment of infraorbital dark circles using 694-nm fractional Q-switched ruby laser. Lasers Med Sci. 2016;31(9):1783–1787. doi:10.1007/s10103-016-2050-4 (PMID 27522505) — Fractional Q-switched ruby, 30 women https://doi.org/10.1007/s10103-016-2050-4
  5. Vanaman Wilson MJ, et al. Prospective studies of the efficacy and safety of the picosecond 755, 1,064, and 532 nm lasers for the treatment of infraorbital dark circles. Lasers Surg Med. 2018;50(1):45–50. doi:10.1002/lsm.22754 (PMID 29135036) — Two open-label arms (n=10 and n=19); funded by the device makers https://doi.org/10.1002/lsm.22754
  6. AlRamthan A, et al. Evaluation of the effectiveness of picosecond KTP and fractional thulium lasers on pigmented-type periorbital dark circles. Lasers Med Sci. 2024;39(1):173. doi:10.1007/s10103-024-04095-y (PMID 38969818) — Split-face, 12 women; post-inflammatory darkening more likely than lightening https://doi.org/10.1007/s10103-024-04095-y
  7. Michelle L, et al. Treatments of Periorbital Hyperpigmentation: A Systematic Review. Dermatol Surg. 2021;47(1):70–74. doi:10.1097/DSS.0000000000002484 (PMID 32740208) — 39 studies; lasers mildly to moderately beneficial; scarce high-quality evidence https://doi.org/10.1097/DSS.0000000000002484
  8. Chiu LY, et al. Corneal burn injury in picosecond laser treatment: A potential hazard in cosmetic therapy. J Cosmet Laser Ther. 2021;23(7-8):218–220. doi:10.1080/14764172.2022.2055077 (PMID 35410570) https://doi.org/10.1080/14764172.2022.2055077
  9. Kesty K, et al. Expert Consensus on Ocular Safety During Laser Procedures. J Cosmet Dermatol. 2025;24(7):e70339. doi:10.1111/jocd.70339 (PMID 40635643) — Metal eye shields mandatory around the eye https://doi.org/10.1111/jocd.70339
  10. National Environment Agency, Singapore. Radiation safety information for apparatus used in the beauty and medical aesthetic industry — class 4 lasers operated only by registered medical practitioners (updated 20 August 2026) https://www.nea.gov.sg/our-services/radiation-safety/radiation-safety-information-for-apparatus-used-in-beauty-and-medical-aesthetic-industry
  11. Wu W, et al. Comparative appraisal with meta-analysis of picosecond versus nanosecond lasers for hyperpigmented disorders and tattoos. Lasers Med Sci. 2025;40(1):465. doi:10.1007/s10103-025-04721-3 (PMID 41184656) — Meta-analysis, 20 RCTs plus 1 retrospective study, 971 patients https://doi.org/10.1007/s10103-025-04721-3
  12. Yu W, et al. A split-face, single-blinded, randomized controlled comparison of alexandrite 755-nm picosecond laser versus alexandrite 755-nm nanosecond laser in the treatment of acquired bilateral nevus of Ota-like macules. J Am Acad Dermatol. 2018;79(3):479–486. doi:10.1016/j.jaad.2017.12.053 (PMID 29288102) — Split-face RCT, 30 patients https://doi.org/10.1016/j.jaad.2017.12.053
  13. Zhou Y, et al. Comparison of 755-nm picosecond alexandrite laser versus 1064-nm Q-switched Nd:YAG laser for melasma: A randomized, split-face controlled, 2-year follow-up study. Lasers Surg Med. 2024;56(3):263–269. doi:10.1002/lsm.23763 (PMID 38282099) — Melasma, randomised split-face; Q-switch less painful, no difference between sides https://doi.org/10.1002/lsm.23763
  14. Ma SY, et al. Split-face comparison of the efficacy of picosecond 532 nm Nd:YAG laser and Q-switched 755 nm Alexandrite laser for treatment of freckles. J Cosmet Laser Ther. 2022;24(1-5):22–27. doi:10.1080/14764172.2022.2049311 (PMID 35400288) — Freckles, split-face; Q-switch 755 nm better than pico 532 nm https://doi.org/10.1080/14764172.2022.2049311
  15. Imagawa K, et al. Prospective comparison study of a 550 picosecond 755 nm laser vs a 50 ns 755 nm laser in the treatment of nevus of Ota. Lasers Med Sci. 2023;38(1):55. doi:10.1007/s10103-023-03721-5 (PMID 36697738) — Naevus of Ota, 10 patients; 4.2 vs 5.4 sessions https://doi.org/10.1007/s10103-023-03721-5
  16. Tian B. The Asian Problem of Frequent Laser Toning for Melasma. J Clin Aesthet Dermatol. 2017;10(7):40–42. (PMID 29104723) — Singapore General Hospital, 23 patients with white spots after frequent Q-switch toning
  17. Wong Y, et al. Hypopigmentation Induced by Frequent Low-Fluence, Large-Spot-Size QS Nd:YAG Laser Treatments. Ann Dermatol. 2015;27(6):751–5. doi:10.5021/ad.2015.27.6.751 (PMID 26719647) — National Skin Centre Singapore, hypomelanosis after Q-switch toning https://doi.org/10.5021/ad.2015.27.6.751
  18. Sugawara J, et al. Influence of the frequency of laser toning for melasma on occurrence of leukoderma and its early detection by ultraviolet imaging. Lasers Surg Med. 2015;47(2):161–7. doi:10.1002/lsm.22325 (PMID 25663133) — 147 patients, leukoderma 2% https://doi.org/10.1002/lsm.22325
  19. Hang X, et al. Hypopigmentation Following Picosecond Laser Treatment for Melasma: A Case Series. Lasers Surg Med. 2025;57(10):777–787. doi:10.1002/lsm.70077 (PMID 41243347) — Hypopigmentation in 3 of 796 patients https://doi.org/10.1002/lsm.70077
  20. Q-switch price: SL Aesthetic Clinic — from S$250 per session (checked 2026-10-08) https://slclinic.com.sg/skin/q-switch-laser-singapore/
  21. Q-switch price: BA Clinic — basic skin toning S$198; targeted pigmentation S$398 (checked 2026-10-08) https://baclinic.sg/treatments/q-switch-laser/
  22. Q-switch price: Ozhean Zoey — from S$180 per session (checked 2026-10-08) https://ozheanzoey.com/curas-q-switch-laser/
  23. Q-switch price: Medical Aesthetics (Toa Payoh) — from S$327 per session, inclusive of GST (checked 2026-10-08) https://www.medical-aesthetics.sg/laser-treatment-for-beautiful-skin
  24. Q-switch price: Lux Medical Aesthetic Clinic — S$1,988 plus GST for 10 sessions (checked 2026-10-08) https://luxaestheticclinic.com/treatment/laser/q-switch-ndyag/
  25. Q-switch price: Cosmo Clinic — laser toning S$68; pigmentation removal S$88, before GST (checked 2026-10-08) https://cosmoclinic.sg/q-switch-laser/
  26. Pico laser price: Halley Medical Aesthetics — S$250 per session (Pico Laser Eye Rejuvenation) (checked 2026-10-05) https://www.halley.com.sg/price-list/
  27. Pico laser price: Nexus Aesthetic Clinic — Pico Eye S$260 (checked 2026-10-08) https://nexusaestheticsg.com/pico-laser-treatment/
  28. Pico laser price: Sozo Aesthetic Clinic — from S$300 per session, dark circles (checked 2026-10-08) https://sozoclinic.sg/dark-eye-circles/treatment/
  29. Pico laser price: Dr Cindy — laser sessions S$400–800 per session, pigmented dark circles (checked 2026-10-08) https://drcindy.com.sg/news-articles/dark-eye-circle-treatment-singapore/
  30. Pico laser price: Lumine Dermatology — PicoSure Pro from S$600 per session (checked 2026-10-08) https://luminederm.com/service/picosure-pro/
  31. Pico laser price: Glowwis — trial S$80 (checked 2026-10-08) https://glowwis.com/services/device-services/pico-laser-in-singapore/

Dark Eye Circles in Singapore: this series

Treatment reviews for dark eye circles:

Comparisons for dark eye circles:

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Dark Eye Circles Singapore

Independent reviews of eye-area concerns and treatments in Singapore. Evidence graded, 2026 prices compared, sources listed.

© 2026 Dark Eye Circles SingaporeGeneral information, not medical advice. Prices checked October 2026.