The terms “dry skin” and “dehydrated skin” are often used interchangeably, but they are not the same thing.

The substantial difference is that dry skin is a skin type and therefore persists over time, while dehydrated skin is a temporary skin condition that can occur in all skin types. Dehydrated skin can have a similar appearance and sensation to dry skin, but it is not an exclusive condition of this skin type. This means that anyone can have dehydrated skin, even oily skin can be dehydrated at the same time due to various factors.

In dehydrated skin, the hydro-lipid content of the stratum corneum shows a lack of water component. This component is important for the barrier function, protection against irritants, and mechanical properties of the skin. What are the causes that temporarily lead to dehydrated skin?

These factors include excessive

• exfoliation
• use of aggressive or unsuitable products for one’s skin type
• exposure to sunlight without application of protection
• weather conditions (cold)
• stress
• diet.

These factors alter the hydro-lipid film, leading to excessive trans-epidermal water loss, and therefore dehydration. When it affects the face, the skin appears dull and lifeless.

by CHIARA DUILIO, BIOLOGIST