We observe our skin through what we see.
- Its radiance.
- Its softness.
- Its imperfections.
- Its fine lines.
- Its texture.
Yet much of its balance depends on a structure we almost never see:
the skin barrier.
It is one of the first interfaces between our body and the outside world.
Day after day, it is exposed to cold, wind, temperature changes, friction, cleansing, and our environment.
When it functions properly, we rarely think about it.
When it is weakened, the skin can quickly make us aware of it.
To understand skincare, we must therefore begin by understanding this barrier.
Where is the skin barrier located?
The outermost part of the epidermis is called the stratum corneum.
It is made up in particular of cells called corneocytes, surrounded by a complex lipid organization.
An image is often used to explain this architecture:
bricks and mortar.
The corneocytes would represent the bricks.
The lipids between them would play the role of mortar.
This comparison is simplified, but it helps explain an essential principle: the skin barrier is not simply a film deposited on the skin.
It is a true biological organization.
Which lipids are we referring to?
Important lipids in the stratum corneum include ceramides, cholesterol, and fatty acids.
Their organization helps maintain the cohesion of the barrier.
These lipids also play an essential role in the skin’s ability to limit excessive water loss.
That is why discussing hydration without discussing lipids gives an incomplete picture of how the skin functions.
The skin must do more than simply contain water.
It must also be able to retain it.
A barrier against water loss
Our skin naturally loses water to the environment.
This phenomenon is normal.
This is known as insensible water loss, or transepidermal water loss.
When the skin barrier functions properly, it helps regulate this loss.
When it is impaired, water can escape more easily.
The skin can then become drier or dehydrated.
- It may feel tight.
- Lose some of its suppleness.
- And suddenly feel less comfortable.
This brings us back to the distinction between dry skin and dehydrated skin that we discussed earlier.
But the skin barrier does more than simply retain water
Its role is much broader.
The skin forms an interface with our environment.
The skin barrier thus helps limit the penetration of many external substances and contributes to protecting the structures beneath it.
It is therefore part of an extremely sophisticated defense system.
This does not mean that the skin is completely impermeable.
It is not.
But its ability to control exchanges with the environment is fundamental.
How can you tell if the skin barrier is weakened?
There is no single sign.
A skin barrier that is impaired may notably present more:
- tightness,
- dryness,
- flaking,
- discomfort,
- or reactions to products that are usually well tolerated.
- The skin may also give the impression that “everything bothers it.”
But these signs are not specific to a single cause.
Persistent redness, significant irritation or an unusual reaction may have various causes and require dermatological advice.
The role of skincare is not to make a diagnosis.
It is about supporting the skin in its daily functioning.
What can weaken this barrier?
Sometimes, we seek so intensely to improve our skin that we end up putting it under too much stress.
- Very frequent cleansing.
- Overly harsh products.
- Repeated exfoliation.
- Accumulation of active ingredients.
- Friction.
- But the environment also plays a role.
- Cold.
- Wind.
- Very dry air.
- Heating.
- Air conditioning.
- Temperature variations.
- Sun exposure.
- The skin barrier is therefore continually adapting.
Cleansing: essential, but in moderation
Cleansing the skin is necessary.
Excess sebum, particles, makeup residue and products accumulated throughout the day should be able to be removed.
But seeking a completely “stripped” skin sensation after cleansing is not necessarily desirable.
This very clear, almost squeaky sensation can sometimes be interpreted as proof of particularly effective cleansing.
In reality, the skin does not need everything on its surface to be removed.
Cleansing precisely is different from stripping.
This is a fundamental distinction in a skincare routine.
More skincare does not always mean a better barrier
When the skin becomes uncomfortable, our first instinct may be to add more.
- A serum.
- Then another.
- An oil.
- A cream.
- A mask.
- An additional active ingredient.
Yet when the skin is under significant stress, temporarily simplifying a routine can sometimes make more sense than making it more complex.
- Suitable cleansing.
- Appropriate hydration.
- Lipids when the skin needs them.
- And sun protection.
The sophistication of a routine is not measured by the number of products in the bathroom.
What role does a cream play?
A cream can serve several functions depending on its formulation.
- It can provide water.
- Humectants that help maintain hydration.
- Emollients that improve suppleness and feel.
- Lipids that contribute to skin comfort.
- Some formulas also contain ingredients specifically chosen to support the barrier function.
But not all creams are the same.
This is precisely why texture and composition must be adapted to the skin’s needs.
And oils?
Oils have a different place.
They generally do not provide water.
On the other hand, they provide lipids and can help improve comfort and limit water evaporation at the surface.
An oil and a cream are therefore not necessarily competitors.
Depending on the skin and the routine, they may serve different functions.
We will return to this distinction in greater detail in our next article devoted to an essential question:
should you hydrate or nourish your skin?
The skin barrier evolves with age
Like many skin mechanisms, its functioning evolves throughout life.
The production of certain lipids may change.
The skin’s ability to maintain its balance may change.
Some skin gradually becomes drier or requires greater comfort.
This explains why a texture perfectly suited to the age of 30 may no longer meet the same needs several decades later.
Skincare should be able to support this evolution.
Not fighting against it.
At SHAYKO, protect before overcorrecting
This understanding of the skin barrier is deeply aligned with our vision of skincare.
We do not believe that skin should be constantly pushed, exfoliated, or corrected.
It already possesses remarkable biological intelligence.
The role of skincare is also to respect this function.
- Cleansing when necessary.
- Hydrating.
- Providing comfort.
- Supporting the barrier function.
- And choosing textures with precision.
This also explains the diversity of textures in our Face universe.
A fluid does not address exactly the same need as a rich cream.
A serum does not play the same role as an oil.
Every step has its place.
Caring for the skin sometimes begins by not disrupting it
This is probably the most important idea.
We often seek the ingredient capable of transforming our skin.
But before seeking to transform it, it may be more relevant to preserve what it already knows how to do.
- Protecting itself.
- Maintaining its balance.
- Renewing its cells.
- Interacting with its environment.
- The skin barrier thus reminds us of a certain approach to skincare.
- Less spectacular.
- But perhaps more accurately.
At SHAYKO, we believe that precision begins here:
understanding the skin before seeking to correct it.
“Caring for the skin does not always mean asking more of it, but often preserving what it already knows how to do.”
SHAYKO Grasse
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