What pico laser can change, how quickly, and how long it holds depends on the pigment. Dr Sin Yong sets out the timeline by concern, and how results are fairly judged.
WhatsApp to Enquire →Key facts ↓Pico laser results depend on the pigment. Many sun spots and freckles lighten after one to three sessions, judged four to six weeks after each; melasma, acne marks and dull tone need a course; tattoos need many sessions. Treated spots look darker for about a week before crusts lift. Progress is judged on standardised photographs of your own skin, and sunscreen decides how long results hold.
People searching for pico laser results usually want two things: to know what the skin will look like after treatment, and when. The answer depends far more on the pigment being treated than on the laser. A sharply edged sun spot can lighten after one or two sessions; freckles lighten and then return with sun; melasma lightens slowly over a course and tends to recur; tattoos fade over many sessions spaced weeks apart; and texture changes after fractional pico take months.
Every pigment treatment also has the same awkward first week. Treated spots turn darker and form fine crusts before they lift, so the skin looks worse before it looks better. That is the broken-up pigment being carried to the surface and shed, and it is the main reason results are judged at review weeks later, not in the mirror on day three.
This page sets out that timeline by concern. It does not show patient photographs: IN Eternity Clinic does not publish patient photographs or patient endorsements to advertise treatment, in line with Singapore’s rules on healthcare advertising, and a photograph of someone else’s skin says little about how yours will respond. For what pico laser is and which platforms are used, see pico laser in Singapore.
| Concern | Typical course | What you see first | When to judge | How long it holds |
|---|---|---|---|---|
| Sun spots (solar lentigines) | Often 1–3 sessions | Darkening and micro-crusts for about a week | 4–6 weeks after each session | Treated spots usually stay lighter; new ones can form with sun |
| Freckles | 1–3 sessions | Darkening, then lighter freckles | 4–6 weeks | Return with sun exposure; the tendency is genetic |
| Melasma | A gentle course of several sessions, with topical care | Little visible change at first | After the course, then at maintenance reviews | Tends to recur; managed rather than cured |
| Post-acne marks (PIH) | A short course alongside topical care | Gradual fading | 6–8 weeks | Holds if new acne is controlled |
| Dull, uneven tone (toning) | A course of several sessions | A brighter, more even look within days of each session | At the end of the course | Maintenance sessions keep the effect |
| Texture, pores, shallow scars (fractional pico) | Several sessions weeks apart | Redness and faint dots for 1–3 days | 3–6 months | Collagen change is gradual and lasting; ageing continues |
| Tattoos | Many sessions, 6–8 or more weeks apart | White-grey frosting, swelling, then gradual fading | Before each session | Faded ink does not return; some colours resist |
Sun spots are the concern most likely to change quickly. In a prospective study of sun spots in Asian patients treated with a dual-wavelength picosecond laser, most lesions cleared after a single session, with the rest needing a second. Melasma is the opposite: in a split-face trial in which weekly picosecond laser was added to a lightening cream, the laser side was lighter at the end of treatment, but the difference had gone by the follow-up visit. That pattern, real improvement that fades without maintenance, is what melasma does, and it is why melasma treatment is a long-term plan.
For spot treatment of sun spots or freckles, a single session usually unfolds like this. Toning and fractional treatments are gentler and faster, and are covered in pico laser downtime, day by day.
Progress is measured on your own skin. At the first visit, standardised photographs are taken in fixed positions and lighting, and some pigment is examined under magnification. At review, the same photographs are repeated and compared side by side with you, so the comparison is fair: the same angle, the same light, no make-up, no filter. These photographs stay in your medical record.
Comparing against memory, or against a phone photograph taken in a different room, is unreliable. Light from a window can hide or exaggerate pigment, and most people notice the spots they are looking for and not the ones that have gone. That is also why other people’s results online are a poor guide: the lighting, the pigment type and the skin all differ.
“The first week after pico laser is the worst week to judge it. Spots look darker before they look lighter, and the honest comparison is made weeks later, in the same light.”
| Factor | Effect on results |
|---|---|
| Pigment type | Sharply edged surface pigment responds fastest; melasma and deep pigment respond slowly and can recur |
| Depth | Epidermal pigment clears faster than dermal pigment such as Hori’s naevus |
| Skin type | Skin types III–V need gentler settings and longer intervals, so courses can be longer |
| Sun between sessions | Unprotected sun brings pigment back and raises the risk of PIH |
| Hormones | Pregnancy and hormonal medicines can drive melasma regardless of laser |
| Aftercare | Picking crusts and early retinoids slow healing and can leave marks |
| Expectations | A course aimed at fewer, lighter spots is achievable; skin with no pigment at all is not a realistic aim |
Wavelength and pulse matter too. Shorter wavelengths such as 532 nm act on surface pigment; longer ones such as 785 nm and 1064 nm reach deeper. Picosecond pulses break pigment mainly by pressure, with less heat spread than the nanosecond pulses of Q-switched lasers. How these compare, and when each is chosen, is explained in pico vs Q-switched vs laser toning.
General clinical observations used at consultation; they describe what is checked, not any individual result.
Pico laser is for benign pigment. Some spots need examination first, and occasionally a biopsy, because laser removes the pigment that would have shown what they were.
These are referred for assessment before any cosmetic treatment. Where a mole needs removing, see mole removal.
Treated sun spots usually stay lighter, but the skin that formed them is still there and new spots can appear with further sun. Freckles return with sun because the tendency is genetic. Melasma is a chronic condition and is expected to recur without maintenance. Tattoo ink that has been cleared does not come back. Texture changes from fractional treatment hold while the skin continues to age at its own pace.
What keeps results is unglamorous: daily broad-spectrum sunscreen, a hat and shade outdoors, and a maintenance session when pigment starts to return. Many people book a review before the sunniest months or after a holiday. The plan and cost of a course are explained after assessment; the consultation fee at IN Eternity Clinic is S$120, waived with any medical treatment.
For sun spots and freckles, many people see a clear change after one or two sessions, judged four to six weeks after each. Melasma, post-acne marks and dull tone need a course, and tattoos need many sessions. The number for your skin is estimated at assessment and reviewed as you go.
Darkening in the first week is expected. The laser breaks pigment into fine particles that rise with the healing surface and form micro-crusts, which lift in about five to ten days. New darkening two to six weeks later is different and should be shown to the clinic.
Sometimes, for a few well-defined sun spots or freckles. Most other concerns, including melasma, dull tone, acne marks, texture and tattoos, need a course. Whether a second session is needed is decided at review, against your baseline photographs.
For spot treatment, the fair comparison is four to six weeks after the session. For fractional pico aimed at texture or pores, change continues for three to six months. For melasma, results are judged after the course and then kept under review.
Treated sun spots usually stay lighter, but new spots can form with sun. Freckles return with sun exposure, and melasma tends to recur, so maintenance and daily sunscreen decide how long the result holds. Cleared tattoo ink does not return.
IN Eternity Clinic does not publish patient photographs or patient endorsements to advertise treatment, in line with Singapore’s rules on healthcare advertising. Your progress is measured with standardised photographs of your own skin, taken in the same light at each visit and kept in your medical record.
It can, uncommonly. Post-inflammatory darkening can follow treatment, especially in skin types III to V after sun or with excess energy, and melasma can darken after strong spot settings. Typing the pigment first, gentle settings and strict sun protection reduce the risk.
For many benign pigmented spots in Asian skin, picosecond lasers clear pigment with less heat spread, and one randomised split-face study found fewer cases of post-inflammatory darkening on the picosecond side. For some uses the two are similar. The choice follows the pigment, not the label.
IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, Singapore 228210. By appointment with Medical Director Dr Sin Yong. Monday to Saturday, 11am to 8pm. WhatsApp or call +65 8815 3008. The consultation fee is waived with any medical treatment.
These sources describe mechanisms and general evidence. They are not a promise of any individual result; suitability is decided at an in-person assessment.