The Skin Printer
Picking up the thread
The last question was whether we can measure the biology of ageing skin.
This time, I'm following that question somewhere stranger; what happens when researchers try to recreate ageing skin itself?
The trail so far
The Skin Age Question
Measuring skin ageing.
The Skin Printer
Modelling ageing skin.
What happens when we stop measuring ageing skin and start trying to build it?
There is something slightly strange about the way we talk about 3D-printed skin.
It sounds as though someone has put human skin into a printer and pressed go.
That isn't quite what is happening.
The interesting part is actually the structure underneath it.
Printing the architecture
Human skin is not simply a collection of cells.
Those cells exist within an intricate physical environment called the extracellular matrix, or ECM. It provides structure, influences how cells behave and contributes to the mechanical properties of tissue.
So if you want to build a useful model of skin, putting the right cells together is only part of the problem.
You also need somewhere for them to live.
This is where Melt Electrowriting, or MEW, becomes interesting.
MEW is a form of high-resolution 3D printing that can create extremely fine polymer fibres.
An electric field draws molten polymer from a nozzle into very fine threads, which can then be arranged into a precisely controlled three-dimensional scaffold.
It is less like printing a piece of skin and more like constructing a microscopic framework for cells to grow through.
In research developed by L'Oréal Advanced Research and the University of Oregon, MEW was used to create scaffolds designed to mimic aspects of the extracellular matrix of human skin. Read the research
Then the cells do the rest
The scaffold itself isn't the skin.
Cultured cells are introduced into it and allowed to grow within the structure.
In a 2024 study, researchers combined a melt-electrowritten dermal scaffold with an electrospun membrane to create a bilayer model containing fibroblasts and keratinocytes.
After 18 days, the model had a differentiated epidermis and a dermis containing newly synthesised extracellular matrix, including collagen and elastin.
The researchers also found that the design of the scaffold influenced how collagen was organised within the developing tissue.
That detail is important.
The goal isn't simply to create something that looks like skin.
It is to create an environment in which cells behave and organise themselves in ways that more closely resemble actual tissue.
Why does the structure matter?
Because ageing doesn't happen to isolated cells.
The environment around those cells changes too.
The extracellular matrix becomes less organised. Collagen changes. Mechanical properties shift. Cells receive different physical and biochemical signals from the tissue around them.
A model that only contains the right cells may miss some of that.
A model that also recreates aspects of their physical environment gives researchers another layer to work with.
It means they can start asking a more complete question: not only what the cells are doing, but what the tissue around them is telling them to do.
And now it gets more interesting
Image: L'Oréal Research & Innovation.
The 2024 work was about building a better model of human skin.
L'Oréal's newer work is asking a different question: can we build a model of ageing skin?
Image: University of Oregon / L'Oréal.
In its 2026 Human Skin Bio-Engineering programme, developed with the University of Oregon, L'Oréal describes using Melt Electrowriting to create ultra-fine fibres that mimic aspects of the skin's extracellular matrix.
These structures can be used to grow aged cells into a biologically aged dermis, including models that reproduce conditions such as fibrosis.
The aim is not simply to make tissue look older.
It is to reproduce aspects of the biology and mechanics associated with ageing tissue, so researchers can investigate whether particular molecules or formulations can change them.
Why build ageing skin?
Because testing an anti-ageing treatment on young, healthy reconstructed skin only tells you so much.
Ageing changes the tissue itself.
If you can create a model that captures some of those changes, you have a controlled system in which to ask much more specific questions.
What happens to aged tissue when a particular molecule is introduced?
Can its mechanical properties change?
Does the extracellular matrix become more organised?
Can some of the characteristics associated with structural ageing be altered?
And perhaps most importantly:
Can we investigate those questions before testing them on a person?
From testing products to testing biology
This is where the technology starts to change the relationship between cosmetics and biology.
Reconstructed skin has been used for decades to study ingredients, formulations and skin biology.
The newer approach is more ambitious.
Instead of treating skin simply as a surface on which a product produces a visible effect, researchers can study it as a biological system with measurable structure, mechanics and cellular behaviour.
L'Oréal describes this newer work as combining biology, mechanics and electronics to investigate skin at different ages and levels of organisation.
The idea is to make the model increasingly representative of the tissue it is standing in for.
Read L'Oréal's Human Skin Bio-Engineering overview
But there is an important catch
A model is still a model.
Even a sophisticated reconstructed skin model is not a complete human face. Real skin exists within a much larger system; it has blood vessels, nerves, immune cells, hormones, microbiota and constant interaction with the rest of the body.
Ageing doesn't happen in exactly the same way in every person either.
So the value of these models isn't that they perfectly recreate a human being. It is that they allow researchers to control variables that are difficult to control in a person, changing one element at a time and observing what happens under defined conditions.
That kind of controlled environment can tell you something that a photograph never could.
The strange part
We started this little trail by asking how old skin actually is.
Then came ways of measuring it; from visual assessments to DNA methylation and protein biomarkers.
Now we're asking whether some of those changes can be recreated in a laboratory model of ageing skin.
The technology is still developing, and the claims around what these models can predict need to be tested independently.
We're moving from asking what ageing skin looks like, to asking what is happening inside it, and eventually, perhaps, whether we can build a model that lets us test how its trajectory might be changed.
If we can build ageing tissue, can we eventually build a better way of testing how to make it age differently?
The trail so far
The Skin Age Question
Measuring the biology of ageing skin.
The Skin Printer
Trying to recreate aspects of ageing skin in the laboratory.
C·🌷
Research notes
Bilayer skin tissue engineering
Girard et al., 2024
First Advanced Bilayer Scaffolds for Tailored Skin Tissue Engineering Produced via Electrospinning and Melt Electrowriting.
Read the full research paper
Human Skin Bio-Engineering
L'Oréal Research & Innovation, 2026
Human Skin Bio-Engineering.
Research overview
3D bioprinted skin models
L'Oréal Research & Innovation × University of Oregon
L'Oréal's Collaborative Breakthrough in 3D Bioprinted Skin Models with University of Oregon.
Research overview
University of Oregon
More realistic artificial skin may lead to medical advances.
Read the research story