Dryness and dehydration

The two main causes of dry skin are external or internal.
External causes:
- Climatic: wind, cold, excessive sunshine, lack of humidity in the atmosphere (air-conditioning, heating).
- Chemical: products with too much detergent, topical medical treatments, unsuitable cosmetics.
- Mechanical: shaving and waxing.
- Physiological: skin ageing.
- Pathological: skin conditions affecting the skin barrier.

Yes, but not just water: we cannot rehydrate the superficial layer of the epidermis simply by drinking water or by wetting the skin. Lipids (fats) are also essential for retaining water.

Yes, this is one of the causes of dry skin. Sun exposure is an attack (burn) in which the epidermis reacts by producing more pigment (a tan) and thickening. The dryness observed is temporary due to increased water loss.

Yes. Some domestic water supplies have a high limescale content: this is known as “ hard ” water. They can increase the drying effect of skincare products. You can soften water by using special devices or compensate for hard water by using ultra-rich products.

Dehydrated skin is dull and tired. It feels rough with dehydration lines. Skin is fragile and lacks suppleness.

There are two reasons for this:
a lack of water with less than 10% water in the outermost layer of the skin (stratum corneum) and an impaired barrier function.

The aim is to nourish and hydrate the skin by limiting damage and irritation. When showering, avoid soap and opt for ultra-rich cleansers or gels enriched with protective and hydrating ingredients. Use emollient creams to hydrate and nourish the skin, and ensure the epidermis is intact, which is essential for its protective barrier function. Applying these emollients regularly is important. Ideally, every day.