Your skin barrier, slugging, and why less is often more

What is the skin barrier?

The skin barrier is the outermost layer of your skin: a wall of flattened dead cells held together by a mortar of lipids, mainly ceramides, cholesterol and free fatty acids. Its job is to keep water in and irritants out. When the mortar is intact, skin looks smooth and feels comfortable. When it is not, water escapes, skin looks dull and flaky, and things that never used to sting start to.

What damages the skin barrier?

Too many strong products used together is the usual way people damage their skin barrier, far more often than any single product. A foaming cleanser twice a day, an exfoliating acid, a vitamin C serum, retinol at night, a clay mask on Sundays, and a new product every time a video says so. Each one is fine. Together, on the same face, they outrun the skin’s ability to rebuild. The tight, shiny, stinging skin that follows is what the internet now calls a damaged barrier. Dermatologists have long called it irritant dermatitis, and the NHS notes that skin inflamed by contact is most often caused by everyday irritants such as soaps and detergents.

How do you repair a damaged skin barrier?

You repair a stressed skin barrier mainly by taking products away, then keeping skin moisturised and protected while it rebuilds.

Take things out before you add things in. Drop the acids and scrubs for a few weeks. Keep a gentle cleanser, a plain moisturiser and sunscreen. Mild “barrier damage” often settles on that alone.

Moisturisers with the right lipids. Ceramide-containing moisturisers have reasonable evidence for improving how dry, rough skin looks and feels: a 2021 review of controlled studies found they helped dry skin and barrier function, while calling for larger trials. You do not need the expensive one. The ingredient is the same.

Occlusives, briefly. This is where slugging comes in: a thin layer of petroleum jelly over moisturiser at night. It works because petrolatum is the most effective occlusive there is, and a review of how moisturisers work reports that it cuts water loss through the skin by more than 98%, far more than lanolin, mineral oil or silicones. It is also cheap and simple, and the NHS describes greasy ointments as good for very dry skin and night-time use. For dry, compromised skin it is a genuinely good trick. For oily or congestion-prone skin it can make things worse, so it is not for everyone.

Fragrance-free while you recover. A disrupted barrier lets more allergens through, as a 2023 review of the skin barrier sets out, so irritated skin is more likely to become allergic to things it meets. Keep it simple and fragrance-free until it settles.

Is a shorter skincare routine better for your skin barrier?

Yes, for most people a short routine is easier on the skin barrier than a long one. A routine of three good products used consistently beats nine used badly. This is not a fashionable minimalism. It is what the barrier can keep up with. The MyAgenix routine is deliberately short for this reason, and if your read shows a stressed surface, it gets shorter still.

General information about skin, not medical advice. MyAgenix offers cosmetic guidance to help you choose products. It does not diagnose or treat any condition. For anything that needs treating, see a pharmacist, your GP or a dermatologist.