These are the causes of dry skin

The two most common factors are:

*Age: the three following mechanisms, in particular, encourage dry skin as people get older: 

1. Sebum production naturally decreases with age.
2. The epidermis is unable to bind as much moisture.
3. Sweat glands produce less sweat.

**Weather conditions: in winter, in particular, many people struggle with dry skin. Low levels of air humidity and cold air outside combined with indoor heating affect the skin and dry it out.