Non-Surgical · Pigment
A pigment course, counted in visits and judged in months
Gangnam, Seoul | Board-certified plastic surgeon, Dr. Jonghwan Choi
KHIDI-registered for international patients · Apgujeong Rewind
Pico laser toning
The short answer
Pico laser toning is a repeated, low-energy treatment that passes a picosecond laser broadly over pigmented skin instead of attacking one spot at high power. Rewind runs it on the Pico K, the picosecond system the clinic describes as delivering a 300-picosecond pulse at 2.9 W, with the stated aim of breaking pigment into fragments small enough for the body to carry away while keeping damage to surrounding skin low.
Toning is a course. One visit is a step in a plan, and the honest unit of measurement is the sequence, not the session. Rewind publishes no fixed number of visits and no interval between them, so neither figure appears on this page; both are set by the doctor after the pigment in front of him has been identified.
The word toning carries specific meaning in a Korean clinic and it is worth pinning down before you book anything. It refers to the low-fluence, whole-field approach: many gentle passes over a region, repeated across weeks. That is a different procedure from a single high-energy shot placed on one discrete brown lesion, and it is different again from clearing tattoo ink, which uses the same class of laser at settings and intervals built for a different target.
Pigment also refuses to behave as one condition. Melasma, sun-induced spots and the brown marks left behind by acne sit at different depths, arise from different triggers and respond at different speeds. A course designed without that distinction is how patients end up paying for visits that were never going to work on the thing troubling them.
What is being treated
Rewind's own description of this device names its uses directly: pigmented conditions including melasma, freckles, blemishes and age spots, along with acne scarring and pore appearance. Those are reproduced below in the order patients usually raise them, with the caveat that identification comes before any of them is treated.
Two things are outside a toning plan even though the same device can do both. Raised moles are removed as lesions, by a different method, and belong on the mole removal page. Ink is its own project with its own settings, its own session counts and a separate line on the price sheet, so tattoo work is quoted after the area has been seen and is not part of any toning course described here.
Mechanism
Four points explain the protocol, and the fourth is the one that decides whether a patient is satisfied a year later.
Compress the delivery of energy into picoseconds and the pigment particle is struck faster than it can shed heat into what surrounds it. The dominant effect becomes mechanical fragmentation instead of thermal injury. Rewind's stated figure for this system is a 300-picosecond pulse at 2.9 W, and that timescale is the whole argument for the device class.
Toning deliberately runs below the threshold that would blister or crust the skin, accepting slower progress in exchange for a gentler course. The protocol itself was established in the low-fluence Q-switched literature, where melasma was treated in repeated sessions and both the gains and the ceiling were documented.
Breaking the particle is half the job; the rest is done by your own tissue over the following weeks. Histological work on melasma treated with low-fluence lasers examined what changes in the pigment-producing cells themselves, so a session is judged weeks later and never in the mirror on the way out.
A study following low-fluence toning for melasma over the long term asked directly whether it holds, and the field's answer is that relapse is common and sun exposure drives it. Anyone told that a course of toning ends the problem for good has been sold something the published follow-up does not support.

Judgement
Toning is the easiest treatment in a clinic to sell in ten-packs and one of the easier ones to overdo. These three positions are how the course is kept proportionate to the diagnosis.
Melasma, solar lentigines and post-inflammatory marks look similar under bad lighting and behave nothing alike under a laser. Dr. Jonghwan Choi assesses which is present, and where the mixed picture is, before a course is quoted. A plan built on the wrong label wastes months of a traveller's planning.
Mottled hypopigmentation after low-fluence toning is documented in the literature, and the papers describing it sit at the foot of this page. Overtreatment is the mechanism behind the worst outcomes in this category, so the answer here to a request for faster progress is usually a longer interval.
A board-certified plastic surgeon who has spent the course lightening a field will say the same thing at every visit: the result depends on what you do outdoors between them. Patients unwilling to use sun protection daily are told the course is a poor use of their money.
On the day

Fig. 04 — Treatment floor, Richro Building

Fig. 05 — Where redness is allowed to settle before you leave
Makeup comes off and the face is cleansed, then the pigment is reviewed under clinic lighting against what was recorded at the previous visit. Eye shields go on for anyone in the room. The pass itself is described by most patients as a light snapping sensation with warmth building over the treated field. Visits run on the fourth and fifth floors of the Richro Building in Gangnam, Seoul, by appointment, Monday, Tuesday, Wednesday and Friday from 10:00 to 19:00 and on Saturday from 10:00 to 16:00.
Anaesthetic arrangements, appointment length and the exact number of passes are not published by the clinic and are therefore not stated here. They are settled in the room, where the pigment can actually be seen. A page that guesses at them is inventing clinical detail, and that habit is how misinformation about laser courses spreads through English-language forums.
Case photography
No case series for this course has been released by the clinic. Pigment photography is also the category where published pairs deserve the most suspicion, because flash, angle and a wiped-off foundation can produce most of the apparent change on their own. The cards stay empty until Rewind has its own consented series shot to a fixed protocol.
When pairs for this course are published they will carry the details that make a pigment photograph checkable: the same camera distance and the same lighting on both dates, a bare face in both frames, the number of visits completed, and the interval since the last one. Consent will be on file for each. No specific outcome can be promised from another patient's skin, and individual results may vary.
Pricing
Both lines below are per visit, which is deliberate: a pigment plan is bought one appointment at a time and reassessed as it goes. The second row is the fractional mode on the same platform, listed here because patients weighing a texture complaint against a pigment complaint should see both figures together.
VAT sits on top of both rates, so the receipt runs above the sheet, and numbing preparation is already counted inside them. Ink removal is priced by the size of the area and is quoted separately after it has been seen. No course total is given before the examination, because the number of visits is the only part of the arithmetic that moves and it is decided from your skin.
Suitability
Recovery
Rewind publishes aftercare for laser treatment as a short list, and it is short because the demands are few and non-negotiable. The four cards below follow that clinic instruction.
The risks deserve naming in full. Temporary redness, mild swelling and a gritty or tender feeling over the field are ordinary. Post-inflammatory darkening can follow in skin prone to it, which is the paradox of treating pigment with light. Mottled hypopigmentation after repeated low-fluence toning is described in published case work and in a study examining the melanocyte changes behind it, and the references are listed below. Blistering or crusting is uncommon at toning settings and should be reported to the clinic. Any new patch of lightening, any area that grows darker instead of fading, and any pain lasting beyond the day of treatment are reasons to come back before the next scheduled visit.
At Rewind, one board-certified plastic surgeon carries every case — from the first consultation to the final follow-up. Because a face is a story, and a story deserves a single author.
Rewind,
Rewind's Doctor
Dr. Jonghwan Choi Medical Director
One surgeon, from the first
consultation to the last follow-up.
A board-certified plastic surgeon devoted to anti-aging lifting — with the precision and restraint built through years of craniofacial practice.
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Scientific evidence
These five papers describe the protocol this course inherits and the limits that came with it: long-term outcomes and relapse in melasma, a comparison of low-fluence treatment with intense pulsed light, histopathology of treated lesions, and two studies of the mottled loss of pigment that follows overtreatment. All of them examine Q-switched systems at low fluence, which is where toning was defined. None was carried out at Rewind Plastic Surgery, and none of them predicts what your own pigment will do.