We can define "dry skin" as a condition in which the skin appears thin, fragile, withered and not very flexible. The stratum corneum tends to flake, and especially in winter, the skin shows frequent chaps - sometimes bleeding ones, particularly at the fingers and other areas subjected to friction. Dry skin is highly sensitive to weather factors, and is irritated by detergents (soaps, syndets, etc.) which often cause a sensation of tightness and itching.It is also possible to distinguish if skin dryness is due to dehydration or lack of lipids. A dehydrated dry skin suffers from excessive water loss due to poor perspiration controls or to increased evaporation provoked by NMF (Natural Moisturizing Factors) deficiency.On the other hand, alipidic-dry skin. i.e., lacking in polar hydrophilic fats, shows a reduction of the surface lipidic film, due to an altered or reduced sebaceous secretion. Of course, these two conditions do almost always coexist and largely contribute to skin early ageing.
Suffers from general hypofunctioning. Usually, hypodermis is thin due to a deficiency in fat reserves. Chorion tends to lose water and becomes less elastic. Furrows appear that result in wrinkles, crow's feet and folds around the mouth. The malpighian layer thins out and loses more water than it receives. Following thinning of the epidermis, capillaries come to the surface, are affected by sudden changes in temperature and are subjected to alterations evidenced by erythrosis, telangiectasis and couperose.Cell turnover decreases, the composition of lipids between keratin-filled cells changes, NMF is produced in small amounts. As a result, the water in the horny layer decreases.Sweat and sebaceous glands
do not supply the appropriate amounts of lipids. This condition results in so-called dry skin. The association of lipid reduction and water loss results in dry, dehydrated skin.