What is the main role of the epidermis in skin health?

The main role of the epidermis in skin health is to provide protection. The epidermis is the outermost layer of the skin, acting as a barrier between the body's internal environment and external elements like pathogens, chemicals, and physical abrasions. Its structure includes multiple layers of cells, primarily keratinocytes, which produce keratin, a protein that helps to strengthen the skin and reduce water loss. This protective function is essential for maintaining skin integrity and overall health, as it helps prevent infections, reduces the risk of dehydration, and protects underlying tissues from environmental damage.

In addition to its protective role, while the epidermis does play a part in other functions—such as contributing to sensory perception via nerve endings or having minor roles in temperature regulation—it is fundamentally foremost a protective layer, which is why it is vital to skin health.