For most of my career, I told patients the same thing everyone in my field tells them.

Layer more products. Add a serum. If it's not working, your routine isn't doing enough yet.

And I believed it. I had the training, the framed certificates, the confidence that came with both.

I also had a growing list of patients who kept coming back almost better — never quite there.

They'd started young, with one or two products that worked for a while. By their 40s, the results had faded, so I did what I was trained to do: I added. Another serum. An essence. A stronger cream. Soon they had a shelf full of bottles and a routine that took twenty minutes.

And their skin still looked tired. Flat. A few hours of glow after everything went on, then right back to where they started. I was watching people do everything right by my own advice — and stay stuck.

For a long time I assumed that was just aging. That skin past a certain point simply gave up, and our job was to slow the decline.

Then a colleague who trained in Seoul asked me a question that embarrassed me a little.

"You keep adding more to the surface," she said. "When did you last ask what's happening in the layer underneath it?"

I didn't have a good answer. So I actually looked — at what Korean dermatology does differently.

And I realized I'd been skipping a step my entire career.