Skin dehydration: causes, symptoms, and advice

The health of our skin is closely linked to its hydration, as water is an essential element of its structure and cell communication. In adults, the skin contains on average 70% water, of which approximately 2/3 is present in the deeper layers (the dermis), and nearly 1/3 in the upper layer, called the stratum corneum of the epidermis, which is the visible part of our skin.

DETERIORATION OF THE TERACROZA CAUSES DEHYDRATION

Water plays a crucial role in hydrating our skin tissue by diffusing from the lower layer (the dermis) to the surface (the stratum corneum). This diffusion is regulated by a natural evaporation process of water contained in our body, called Insensible Water Loss (IWL). However, the stratum corneum is supposed to limit this process thanks to its hydrolipidic film.

THE HORNED LAYER

The stratum corneum is the outermost layer of the epidermis, the one that is visible and palpable on the surface. Above the stratum corneum lies the hydrolipidic film.

THE HYDROLIPIDIC FILM

The hydrolipidic film consists of an emulsion of water (water and sweat), and fat.
Its main functions are:

• Forming an external protective barrier against bacteria thanks to its acidic pH.
• To actively contribute to the suppleness, radiance, softness, and hydration of the skin.

When facial skin becomes dehydrated, it loses its radiance and can feel tight, often temporarily:

• after cleansing the skin, just before applying cream
• when you smile or move your face

If it is not rehydrated, the skin can eventually develop small "streaks" on its surface.