Your Skin Barrier, Explained: Signs, Stressors and Gentle Care

"Skin barrier" has become one of the most talked-about phrases in skin care, and for good reason. When your barrier is comfortable, skin tends to look and feel calm. When it is stressed, even products you love can start to sting¹. The good news is that caring for it is mostly about doing less, more gently.

What your skin barrier is

Your skin barrier is part of the stratum corneum, the very top layer of your skin. A Cleveland Clinic dermatologist describes it as a layer of dead cells, lipids, proteins and fats that works to keep water in and to keep chemicals and infectious bacteria out¹.

The easiest way to picture it is a brick wall¹:

• The bricks are corneocytes, the tough skin cells that make up the wall¹.
• The mortar is a blend of natural lipids, such as ceramides, cholesterol and fatty acids, that fills the gaps between those cells¹.

That mortar matters. A review in Clinical Medicine & Research explains that losing these lipids between the cells damages the skin's water barrier and leads to dry skin². Another Cleveland Clinic dermatologist adds that aging and certain skin conditions, such as eczema, involve lower ceramide levels, which can leave skin dehydrated or itchy³.

Signs your barrier is stressed

A stressed barrier usually tells you how it feels. Signs to notice include:

• Stinging, especially when you apply skin care products¹.
• Redness and irritation, or skin that feels tender or sensitive¹.
• Dry, flaky or rough patches, sometimes with itching¹⁵.
• A tight feeling after washing. Cleanser removes some of your skin's natural oils and moisturizers along with the dirt, and a dermatologist notes that skin will often feel tight afterward, especially with a medicated cleanser⁴.

If any of these linger, the section on seeing a dermatologist below is worth a read.

What wears it down

Many everyday habits chip away at the mortar. The most common:

• Hot water. One dermatologist compares the barrier to butter on a knife: under hot water it melts away, and hot water does the same to your skin's healthy natural oils¹.
• Over-cleansing and harsh soaps. Soap can strip your skin's natural oils, and lingering over your cleanser does not help: there is no benefit to massaging it in longer, and the fatty layer of your barrier can begin to break down¹.
• Harsh scrubs and over-exfoliating. Scrubbing and over-exfoliating are among the habits that can break down the barrier¹, and the AAD notes that over-exfoliation can leave skin red and irritated⁶.
• Too many actives at once. The AAD cautions that using several anti-aging products at the same time can irritate your skin⁷. Exfoliating while using retinol or benzoyl peroxide may also worsen dry skin⁶.
• Dry air. Cold, dry winter air, hot and dry climates, and dry indoor air from heating or cooling systems can all contribute to dry skin⁵.

Gentle habits that help

The dermatologist advice here comes down to one idea: be very gentle when you care for your skin¹. In practice, that looks like this:

• Choose lukewarm water. Lukewarm is best for most people, while hot water can strip the skin barrier and lead to more dryness⁴.
• Use a mild cleanser and your fingertips. Look for a soap-free, fragrance-free cleanser made for sensitive skin¹. Apply it with your fingers, since a washcloth, loofah or brush can be harsh, then pat dry instead of rubbing⁴.
• Moisturize while skin is still damp. The AAD advises applying moisturizer while your skin is still damp after a shower or bath⁸, and a Cleveland Clinic dermatologist suggests doing it within three minutes of showering or washing your face³.
• Introduce one active at a time, and patch test first. Start with one product⁷. To test it, the AAD suggests applying it twice a day for seven to 10 days to a quarter-sized spot, such as the underside of your arm or the bend of your elbow; if there is no redness, itching or swelling, go ahead⁹. Some ingredients, such as retinol and glycolic acid, can still cause temporary irritation⁹. If you are weighing your options, our guide to bakuchiol vs. retinol walks through the differences.
• Wear sunscreen every day. The AAD recommends a broad-spectrum, water-resistant sunscreen with an SPF of 30 or higher⁸, and the best one is the one you like, can afford and will actually use every day¹.
• Add moisture to the air. If your home is dry, the AAD suggests a humidifier, cleaned regularly to prevent mold⁸.

What your moisturizer is actually doing

Most moisturizers combine three kinds of ingredients, each with a different job²:

• Humectants attract water into the outer layer of skin, both from deeper layers of skin and from humid air². Glycerin, hyaluronic acid, urea and panthenol are examples².
• Emollients are mostly lipids that fill the gaps between skin cells, helping skin feel smoother, softer and more flexible². Ceramides, cholesterol and fatty acids, the same lipids found in your barrier's mortar, are common skin care ingredients¹.
• Occlusives form a water-repelling layer over the skin that slows water loss². Petrolatum is the classic example, and lanolin, mineral oil and dimethicone also belong here².

The combination matters. On their own, humectants can increase water loss, because the water they draw up toward the surface can evaporate, which is why they are often paired with occlusives². Occlusives also work best on slightly damp skin², one more reason to moisturize right after washing. If your skin runs dry, the AAD notes that creams and ointments add more moisture than lotions⁸. If you like a simple finishing step, our Daily Face Cream is a silky option for morning and night.

When to see a dermatologist

Gentle habits go a long way, but some skin needs more. Conditions such as eczema, rosacea and psoriasis are associated with a poor skin barrier, and in those cases it is best to work with a dermatologist¹. Consider booking a visit with a board-certified dermatologist if:

• Your skin stays dry after you have tried these tips. Overly dry skin may be due to an underlying condition, such as atopic dermatitis or psoriasis⁸.
• You have an itchy rash, especially one that comes and goes. It can be a sign of contact dermatitis, which develops when something that touches your skin irritates it or causes an allergic reaction¹⁰.
• A product causes a severe reaction that cool compresses or petroleum jelly do not relieve, or you cannot pinpoint what is irritating your skin. A dermatologist may suggest a medical test called patch testing to find the cause⁹.
• Anything you apply, including moisturizer, causes burning, stinging or irritation. The AAD says to tell your dermatologist⁸.

The takeaway

Your skin barrier is a wall of cells held together by lipids, and it does its best work when you treat it gently. Wash with lukewarm water and a mild cleanser, moisturize while your skin is still damp, add new actives one at a time after a patch test, and wear sunscreen every day. If irritation lingers or a rash appears, a board-certified dermatologist is the right next step.

This article is for general information and is not medical advice.