Skin Trek · Clinical Guides
The Nerd
Section.
Opinionated, evidence-based guides on aesthetic medicine. Written by a physician with 16+ years of clinical experience across Taiwan, China and Canada. No trends, no exaggeration — just the things worth understanding before you make a decision about your face.
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Pico or Q-switched for melasma? What one small split-face trial found.
A 2026 randomised split-face trial put a picosecond and a Q-switched 1064 nm laser side by side in Asian skin. What it found, what it does not prove, and what it means for patients and for clinics choosing a laser.
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The skin-tightening debate is asking the wrong question.
Sofwave's approval in China put the question back on the table for clinics that already own Thermage and Ultherapy. A sequel arguing that tightening should be selected by measured tissue thickness rather than ethnicity or device loyalty.
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Before I treat the brown, I look at the red.
Melasma is not only a melanin problem. Why vascularity and inflammation change what I do, what the 2026 data shows about mixed pigmentary and vascular melasma, and the Hollywood Spectra step I run before anything pigment-specific.
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XERF: Deep mode all the way?
Deep mode across nearly the whole face, with handpiece speed used to fine-tune how much heat accumulates. Why the three settings are not a depth ladder, what speed actually controls, and where this diverges from the protocols that have been studied.
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What buying XERF made me notice about Taiwan.
The purchase sent me back to a market I used to work in. Korean devices now account for more than half of it, and Taiwan often shows what North America starts paying attention to later.
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XERF vs. XTherma. Two different machines.
They sound alike, they are both Korean, and they are both monopolar RF. One runs two frequencies, the other runs one. What separates them, and which of them you can actually get in Canada.
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Can radiofrequency melt fat?
Yes, it can. But the more interesting question is when a skin-tightening treatment becomes a fat-reduction treatment. A discussion of thermal dose, adipocyte injury, and why technique changes everything.
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Sliding vs. stamping. The monopolar RF debate isn't about technique.
It's about thermal dose. A heat-transfer perspective on why the same machine, same settings, and same pulse count can still produce different results in different hands.
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Why we chose XERF over Thermage. And why we still use Ultherapy.
After nearly twenty years and more than 10,000 Thermage treatments, and time as a Thermage clinical trainer, here is how I evaluated the options and why we landed on XERF.
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Ultherapy vs. Thermage vs. Sofwave. Side by side.
Written by a former clinical trainer for both Ultherapy and Thermage in Canada. All three are good technologies. The device is not the main variable. The operator is.
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Sculptra vs. fillers is the wrong question.
Sculptra and fillers are often pitted against each other. The better question is when to use each — and when to combine both. A clinical framework for understanding two fundamentally different tools.
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Sculptra in Toronto. A quieter kind of rejuvenation.
Why Toronto patients make the drive to Richmond Hill — and what a full course of Sculptra actually looks like, week by week, over two years.
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Why your temples look hollow — and what to do about it.
Temple volume loss is one of the earliest and most overlooked signs of facial aging. Most patients don't know it's happening until it's significant. Here's what's actually going on and what helps.
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Avoiding the overfilled look. Why it keeps happening.
The overfilled look is not a Sculptra problem or a filler problem. It is a technique and philosophy problem. What causes it, why it is so common, and how to avoid it.
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East Asian facial aesthetics. What most injectors miss.
Years of practice in Taiwan and China, then Canada. The anatomical differences that matter, the aesthetic preferences that are real, and the mistakes that happen when injectors treat every face the same.
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How to choose an injector. The questions worth asking.
Credentials matter. So do philosophy, restraint, and what happens when something goes wrong. A guide to finding the right injector — not just the most available one.
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A note on these guides. Everything here reflects the clinical perspective of Dr. Andy at Skin Trek — not industry consensus, not marketing copy. Some of it will be opinion. Where it is, we say so. Where it is evidence-based, we try to be specific about what the evidence actually shows.