Published 20 October 2026 · Reviewed by Dr Sin Yong
What to expect at a pico laser visit with Dr Sin Yong starts before the laser: retinoids and exfoliating acids are paused, sun is avoided, and the pigment is examined and named. A test patch is used where the skin's reaction is uncertain. The session itself is a rapid snapping sensation in spot, toning or fractional mode, followed by warmth, possible darkening and flaking, strict sun protection and a review.
Short answerThe first visit is usually a diagnosis rather than a laser session. Treatment follows a written plan naming the mode and wavelength, and the pigment's response is read at review before anything further is planned. This page sits under pico laser in Singapore; the checklist for afterwards is on pico laser aftercare.
Preparation for pico laser begins at the consultation, which is a separate visit from the laser. Dr Sin Yong takes the history, examines the skin in appropriate light, with a dermatoscope where needed, and works out what the pigment is, because a sun spot, a post-inflammatory mark and melasma call for different plans and melasma is provoked by heat. A written plan names the mode, the wavelength and the review, with topicals or no laser among the options. What suits pico and what does not is on pico laser suitability.
Illustrative image — not a patient.
Between that visit and the laser, the skin is brought to a settled state. Retinoids and exfoliating acids are paused on the area as advised, because they thin the surface and make it more reactive. Tanning and strong sun are avoided, since a recent tan raises the risk of darkening and treatment is deferred until it has faded; daily sunscreen starts before the first session rather than after it. Photosensitising medicines, pregnancy, a keloid tendency and cold sores are declared.
What is a pico laser test patch, and when is it used?
A test patch is a small area treated first, at the planned settings, and read after the delay in which darkening appears in Fitzpatrick III to V skin. It is used where the skin's reaction is uncertain: after darkening following an earlier laser elsewhere, where the diagnosis sits between two pigment types, or where fractional mode is planned on skin that has not had it before. It is not used on every face, and it is not a trial of whether the treatment works; it is a reading of how your skin heals. Why darker skin reacts as it does is on pico laser in Asian skin.
The patch is placed somewhere it can be judged against untreated skin nearby. If it darkens, the settings, the mode or the plan change before the full area is treated; if it heals cleanly, the session goes ahead as written.
“I name the pigment before I choose the wavelength, and I read the skin before I fire again. A laser that is aimed at a diagnosis behaves; a laser aimed at a brown patch does not.”
Dr Sin YongOn how a pico laser session is planned
What does a pico laser session involve?
On the day the plan is confirmed and the skin is cleansed. A topical anaesthetic is applied where the area or the setting calls for it; low-energy toning across the face is often done without. Protective eyewear goes on, and Dr Sin Yong delivers the laser himself as the T2 Frax Radiance protocol on the DEKA TORO, in the mode the plan named: spot treatment of a discrete mark, low-energy toning for diffuse tone, or fractional delivery for texture.
Most people describe a rapid snapping sensation, like a fine elastic band, with each pulse, and a sense of warmth that builds over a treated area; tolerance varies, and the brief, high-energy pulses over a single sun spot feel sharper than the gentle repeated passes of toning. Fractional mode feels hotter and pricklier, because it creates small zones of treated skin with intact skin between them. Where the pigment sits with inflammation, the plan may have chosen R2 Glow instead. No shot count is promised.
What happens on the same day and in the first week after pico laser?
What the skin looks like afterwards depends on the mode. After toning there is warmth and redness that settle soon after. After spot treatment the treated marks darken and form a fine crust that flakes away on its own and must not be picked. After fractional delivery there is pinpoint redness, mild swelling and a rough feel while the skin renews, and its aftercare is the longest of the three. Written aftercare is given for the mode used, and the checklist is on pico laser aftercare.
Through the first week the rules are the same in every mode: gentle cleansing, a bland moisturiser, no actives, no picking, no heat, and strict sun protection, because ultraviolet light on healing skin is the surest way to turn a treated spot into a darker one. Make-up can go on over intact skin once any crusts have settled; exercise that leaves the face flushed is left until the warmth has gone. What recovery looks like mode by mode, and what is not normal, is on pico laser downtime and side effects.
What needs a call
Crusts that become thick, yellow or oozing, or blisters appearing over a treated area.
Pain, swelling or warmth that is increasing instead of settling.
Dark marks that appear later: these are reviewed, not treated over.
What happens at the pico laser review?
The review is where the next step is decided, and it is timed to when the pigment can be read: after the crusts have gone and after the delay in which post-inflammatory darkening would appear. Dr Sin Yong examines the treated area in the same light as at consultation, with the dermatoscope where needed, and compares it with the photographs in your record. He is looking for three things: how the target pigment has responded, whether any new darkening has followed the treatment, and whether the skin has healed evenly.
From that reading comes the plan for what follows, which can be a further session, a change of mode or wavelength, a switch to topicals and sun protection, or nothing further. Toning is not run on an open-ended schedule, and a mark that has darkened is reviewed rather than treated over. Where pigment and scars coexist, the sequence with fractional CO2 is set at review, as pico laser with the S3 Resurfacing Lift explains. How the number of sessions is decided, without a number, is on how many pico laser sessions.
Your next step
1. MessageWhatsApp +65 8023 7170 with what is bothering you. A reply comes from the clinic, not a bot.
2. AssessmentDr Sin Yong examines you himself on Orchard Road, with ultrasound where earlier filler is involved.
3. A plan in writingWhat he would do, what he would not, the fee factors, and the option of no treatment.
Every treatment is performed by Dr Sin Yong personally. Singapore Medical Council registered · invited to share his clinical expertise internationally for CLASSYS, DEKA, Fotona, Hironic and Ilooda.
Book an assessment with Dr Sin Yong on Orchard Road; come without a tan and with a list of your skincare actives. How consultations work.
Retinoids and exfoliating acids are paused on the area as advised at consultation, because they thin the surface and make it more reactive to the laser. Sunscreen continues and starts before the first session. Photosensitising medicines are declared, and a recent tan means the session is deferred until it has faded. Your own instructions, given in writing, take priority over this page.
Most people describe a rapid snapping sensation with each pulse, like a fine elastic band, and warmth that builds over a treated area. Spot treatment of a single mark feels sharper than the gentle passes of toning; fractional mode feels hotter and pricklier. A topical anaesthetic is applied where the area or setting calls for it. Tolerance varies, and it is planned for.
A test patch reads how your skin heals at the planned settings before the whole area is treated. It is used where the reaction is uncertain, such as after darkening from an earlier laser elsewhere or before fractional mode on skin that has not had it. It is judged after the delay in which darkening appears, and the plan changes if it darkens.
It depends on the mode. After toning there is warmth and redness that settle soon after; after spot treatment the marks darken and form a fine crust that flakes away on its own; after fractional delivery there is pinpoint redness, mild swelling and a rough feel while the skin renews. Make-up can go on over intact skin once any crusts have settled.
How the target pigment has responded, whether any new darkening has followed the treatment, and whether the skin has healed evenly. The review is timed to after the crusts have gone and after the delay in which post-inflammatory darkening would appear. The next step, including no further laser, is decided from that reading rather than booked in advance.
References
A Systematic Review of Picosecond Laser in Dermatology: Evidence and Recommendations. Lasers in Surgery and Medicine 53(1), 2021. source
A retrospective analysis on the management of pigmented lesions using a picosecond 755-nm alexandrite laser in Asians. Lasers in Surgery and Medicine 48(1), 2016. source
The prevalence and risk factors of post-inflammatory hyperpigmentation after fractional resurfacing in Asians. Lasers in Surgery and Medicine 39(5), 2007. source
About this page: written and medically reviewed by Dr Sin Yong, MBBS (NUS), MRCS (Edinburgh) · Last reviewed 20 October 2026 · Illustrative images only, not patients · Editorial policy
