Dry skin is characterized by a disruption in cellular cohesion (skin barrier), a deficiency in natural moisturizing factors (NMF), and an insufficiency in the production of lipids. This lack of hydrolipidic film exposes the epidermis to external aggressions and causes water loss. What is the skin barrier? What are the signs related to its alteration?
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Dry Skin: How to Determine if Your Skin Barrier is Damaged?
Summary
Published August 30, 2022,
updated on February 16, 2024,
by
Maylis, Chemical Engineer
—
4 min read
What is the skin barrier?
The skin barrier is none other than the upper layer of the skin, composed of dead cells (corneocytes) and referred to as the horny layer. It is also referred to as the "acid mantle", due to its slightly acidic pH, around 5.5. This acidic pH helps to limit the colonization of pathogenic foreign bodies on the skin surface.
The primary role of the skin barrier is to shield against pathogenic elements and to limit insensible water loss. It thus protects the body from physical toxins (such as pollution and harmful chemicals) and the sun's ultraviolet rays.
As a reminder, the skin is composed of three main layers:
theepidermis, the outermost layer of the skin, which is not vascularized, and is covered by the stratum corneum or skin barrier;
the dermis, an intermediate layer that contains proteins (collagen, elastin...), nerves, and blood vessels;
thehypodermis, rich in adipose cells that form a barrier between the skin and the muscles.
The epidermis contains three types of cells: the keratinocytes, which can be compared to "bricks" bound together by a "cement" composed of lipids (fatty acids, ceramides, cholesterol, etc...), the melanocytes, which produce melanin that protects the skin from the sun's UV rays, and the Langerhans cells that provide a defense against bacteria, fungi, and viruses.
How can I tell if my skin barrier is compromised?
If the outermost layer of the epidermis (the stratum corneum) does not contain enough water, the skin loses its elasticity and appears dry, rough, and flaky. Poorly hydrated skin is also unable to maintain an appropriate intact skin barrier, which makes the skin more vulnerable to damage from environmental sources. As a result, it tends to show signs of aging more quickly (skin sagging, wrinkles).
Several factors can damage the skin barrier: smoking, lack of sleep, stress, a diet poor in nutrients, pollution, wind, UV radiation, too frequent washing, the use of overly harsh cleansers, excessive use of exfoliating acids like glycolic acid, and too frequent mechanical exfoliations.
The disruption of the essential functions of the skin barrier can manifest in several ways:
A chronic skin irritation;
Itching ;
A dull skin;
A delay in wound healing;
The emergence of dead skin cells due to an excessive flaking;
Of premature aging signs (wrinkles and fine lines that begin to appear or intensify prematurely);
Theworsening of certain skin discomforts such as rosacea and eczema. Indeed, these conditions are partly caused by a defect in the skin barrier. However, additional external damage to an impaired skin barrier can trigger a flare-up of these conditions.
If these symptoms are familiar to you, we recommend using products enriched with moisturizing and lipid-replenishing active ingredients (hyaluronic acid,ceramides,squalane, vegetable oils, vegetable butters, etc...).Find all our products dedicated to dry skin here.
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