The skin barrier is the protective outer function of the skin that helps limit water loss and protects underlying tissues from physical, chemical, and biological threats.
The outermost layer of the skin, particularly the stratum corneum, plays a major role in this barrier. Its cells, lipids, proteins, and other components work together to maintain hydration and limit penetration of harmful substances and microorganisms.
Harsh chemicals, excessive washing, inflammation, some skin diseases, and environmental exposures can disrupt the skin barrier, potentially causing dryness, irritation, increased sensitivity, or impaired protection.
QUICK FACT
A healthy skin barrier does not mean completely impermeable skin. The skin allows controlled movement of some substances while limiting others.
COMMONLY CONFUSED WITH
- Skin microbiome: the community of microorganisms living on the skin.
- Epidermis: the outermost major layer of the skin; the skin barrier is a function involving several components, particularly the outer epidermis.
SEE ALSO