The outermost layer of skin that keeps moisture in and irritants out.
Skin barrier
Why it matters
A damaged barrier drives dryness, sensitivity, and breakouts — protecting it beats treating symptoms.
In practice
Simplifying a routine to gentle cleanser and moisturiser while the barrier recovers.
Related terms
Ceramides, Moisturiser
Definitions in the Knowledge A–Z are general education, not medical advice. They do not diagnose or treat any condition. Speak to a qualified professional about anything specific to you.