Is the skin just a simple barrier?

No, it is much more than that, and this accounts for the many
physical and psychological effects that it can have, especially if
you are badly affected by eczema. It is the last line of defence
against the outside world, protecting our bodies from external
attack and keeping the right conditions inside (homeostasis)
through its prevention of loss of fluid and regulation of temperature.
It also allows for a display of individuality through decoration,
jewellery and hair-styling.
Skin, therefore:
• acts as a barrier to physical agents including ultraviolet
radiation;
• protects against mechanical injury;
• defends against microbes;
• is involved in homeostasis – preventing the loss of water
and electrolytes;
• regulates temperature and insulates;
• is involved in sensory functions;
• is integral to fine touch and grip;
• is the site of vitamin D synthesis;
• acts as a calorie store in the subcutaneous fat;
• has cosmetic, psychosocial and display functions.