The concept of dry skin has also never been clearly defined. The term “dry skin” conceals several complementary or opposite points of view (4). It remains completely different from the way it is approached. People connect this notion to the effects observed and to their sensorial dimension. Therefore, for them it is first of all a feeling of drying along with loss of skin suppleness and elasticity, characterized by a rough appearance often associated with an important desquamation, and leading to a certain discomfort they intend to correct by using moisturizing products.
For the biologist, the xerosis would be first the consequence of a change of the coherence and functionality of corneocytes, the water deficiency of the superficial layers of the stratum corneum, when it exists, only resulting from it.
As a matter of fact, the physiopathogeny of most xerosis is still badly known, and it
remains difficult to distinguish the causes from the consequences of these skin abnormalities (5).