How many pico laser sessions?
What decides it, not a number

Why is there no fixed number of pico laser sessions?

There is no fixed number because pico laser treats pigment that is already present, and how much is present, how deep it sits and whether the skin keeps making more differ from person to person. A picosecond pulse fragments pigment largely by a pressure effect; the body then clears the fragments, and that clearance is gradual and uneven. A count given before the skin has been examined describes a package, not a plan.

Dr Sin Yong therefore plans pico laser one review at a time. The first visit treats what the examination finds; the review assesses how the pigment responded; and only then is the next step decided. The page on how fees are quoted explains why nothing is sold in advance, and the page on what happens at a consultation sets out the sequence.

How does the pigment type change the plan?

A discrete sun spot is epidermal, well defined and the presentation that tends to respond most readily: the treated spot darkens, crusts and sheds, and the review decides whether anything remains. Freckles are many small epidermal spots that darken again with sun, so the plan is as much about photoprotection as about the laser. Post-inflammatory marks fade on their own timeline, and treating them before the cause, such as acne, is controlled invites new marks behind the old ones.

Melasma is the exception that changes the whole approach. It is chronic, driven by hormones, vessels and ultraviolet light, and no laser touches those drivers. Picosecond toning is used conservatively inside a plan built on sun protection and topical therapy, and the question at review is whether the skin is calm and lighter, not how many visits remain. Dermal pigment, which sits deeper, is cleared more slowly and may need a different wavelength, which also lengthens the course.

“A pico laser breaks up pigment that is already there. It does nothing about the reason your skin made it — which is why melasma comes back and a sun spot usually does not.”

Dr Sin YongOn what the technology does and does not reach

Why does skin type set the pace?

Fitzpatrick III to V skin, the predominant types in Singapore, makes melanin readily when injured, so the energy that clears pigment fastest is also the energy most likely to write a new mark where the old one was. Conservative settings, longer gaps between visits and strict sun protection are how that risk is managed, and each of those can add visits rather than subtract them. The page on pico laser on Asian skin explains the reasoning in detail.

Sun exposure between visits works the same way. Freshly treated skin is more vulnerable to ultraviolet light, and new pigment formed in that window has to be treated again. In Singapore's year-round sun, daily broad-spectrum protection, shade and a hat are part of the treatment rather than an optional extra.

What happens at the review, and how is the next step decided?

At review the treated areas are compared with the photographs taken for the medical record, under the same lighting, and one of four things is found. The pigment has cleared, and the plan moves to protection and maintenance. It has lightened, and a further treatment at the same or adjusted settings is reasonable. It has not changed, which raises the question of whether the diagnosis or the wavelength was right rather than whether to repeat. Or it has darkened, which is usually post-inflammatory hyperpigmentation, and the right step is a pause with sun protection and topicals, not another pass.

That is why the number of visits is an outcome of the plan rather than its starting point. The interval between visits is set the same way, from how the skin has settled, not from a calendar.

Does the mode or wavelength affect how many visits?

Yes. Spot treatment of a single mark is a different course from low-energy toning across the whole face, which works in small steps by design, and from fractional mode, which addresses texture through gradual remodelling rather than pigment removal. Wavelength matters too: the shorter wavelength is absorbed strongly by melanin and suits superficial spots, while the longer wavelength reaches deeper pigment with less absorption at the surface and is the more conservative choice in darker skin. The T2 Frax Radiance protocol combines these modes on one platform, and which modes are used, and in what order, is decided from the examination.

What can you do between sessions to avoid needing more?

Protect the skin from the sun every day, do not pick at crusts, pause strong actives until told to restart them, and keep any acne or inflammation under control so that no new marks form. If a treated mark darkens later rather than fading, have it reviewed instead of booking another pass. The pico laser downtime guide describes what each mode looks like afterwards and which signs need a call.