Genetic influences
Moisture levels in the skin are partly determined by genetics. Some people are genetically predisposed, and inherit a tendency for dry skin. Under identical conditions, different people will have different skin types. Fair-skinned individuals seem to be more prone to dry skin than people with darker complexions. Diseases such as Atopic Dermatitis, Psoriasis, diabetes and ichthyosis have a genetic predisposition.
Hormonal influences
Hormonal changes, such as pregnancy or menopause, can result in skin becoming dry.
Age
As people get older their skin’s ability to produce sweat and lipids is decreased due to the reduction in the function of sebaceous and sweat glands in the skin. Dry skin and ageing are interrelated, and can form a vicious cycle. Read more about age-induced dryness.
Diet
A lack of nutrients, unsaturated fatty acids and vitamins can contribute to dry skin. Vitamin C and E are also involved in maintaining healthy skin.
Read more about factors that influence skin.