Eczema, clinically known as atopic dermatitis, affects approximately 15 to 20 percent of children and 1 to 3 percent of adults worldwide. It presents as dry, itchy, inflamed skin that can significantly impact quality of life. While eczema is a complex condition with genetic, immunological, and environmental components, the fundamental problem is a compromised skin barrier. Understanding how the barrier works and which ingredients effectively repair it is the key to managing eczema and chronic dry skin.
The Skin Barrier in Eczema
The outermost layer of the skin, the stratum corneum, functions as a brick-and-mortar barrier. The skin cells are the bricks, and the intercellular lipids are the mortar that holds them together and prevents water loss. In healthy skin, this barrier is intact and effectively keeps moisture in and irritants out. In eczema-prone skin, the barrier is compromised at the molecular level.
The primary defect in most people with eczema is a mutation in the filaggrin gene. Filaggrin is a protein that helps skin cells flatten and form the protective barrier. It also breaks down into natural moisturizing factors (NMFs) that keep the stratum corneum hydrated. Without enough filaggrin, the barrier is leaky. Water evaporates too quickly, leaving skin dry and cracked, and environmental triggers like allergens and bacteria can penetrate more easily, triggering inflammation and itching. This creates a vicious cycle: scratching damages the barrier further, leading to more water loss and more inflammation.
Ceramides — The Essential Barrier Lipids
Ceramides are the most critical component of the skin barrier, accounting for approximately 50 percent of the intercellular lipids. Healthy skin contains at least nine different types of ceramides, each playing a specific role in barrier function. In eczema-prone skin, ceramide levels are significantly reduced compared to healthy skin, and the ratio of ceramides to cholesterol to free fatty acids is disrupted.
The optimal ratio for barrier repair is approximately 3:1:1 of ceramides, cholesterol, and free fatty acids. Skincare products formulated with this ratio are more effective at repairing the barrier than products with ceramides alone. Look for products containing ceramide NP, ceramide AP, and ceramide EOP in combination with cholesterol and linoleic acid. CeraVe, Cetaphil Restoraderm, and SkinFix Barrier+ are examples of brands that use the optimal lipid ratio.
Colloidal Oatmeal and Urea
Colloidal oatmeal is one of the few ingredients that has FDA approval as a skin protectant for eczema. It contains beta-glucans, which form a protective film on the skin, avenanthramides, which are potent anti-inflammatory compounds that reduce itching, and saponins, which gently cleanse without stripping. Clinical studies have demonstrated that colloidal oatmeal-based moisturizers significantly improve skin hydration, reduce itching, and decrease the need for topical corticosteroids.
Urea is a naturally occurring humectant that draws water into the stratum corneum. At concentrations of 5 to 10 percent, urea provides deep hydration while gently exfoliating the dry, flaky skin that often accompanies eczema. At higher concentrations (above 20 percent), urea becomes keratolytic and is used to treat thickened, callused skin. For eczema and dry skin, 5 to 10 percent urea creams are well-tolerated and effective. Urea also has mild antimicrobial properties that can help reduce bacterial colonization on eczema-affected skin.
Petrolatum and Occlusives
Petrolatum is one of the most effective and most misunderstood moisturizing ingredients. It is a pure mixture of hydrocarbons that forms an impermeable barrier on the skin, reducing transepidermal water loss by up to 99 percent. No other moisturizing ingredient matches petrolatum's occlusive power. Despite misconceptions, modern highly refined petrolatum is safe, non-comedogenic, and does not cause cancer. It has been used safely in skincare and medicine for over 150 years.
For eczema management, petrolatum-based ointments are more effective than cream-based moisturizers because they provide superior occlusion and do not contain water that can evaporate and dry the skin further. The main drawback is texture — petrolatum is thick and greasy, which some people find unpleasant. Alternatives like shea butter, dimethicone, and squalane provide milder occlusion with better cosmetic elegance, though they are less effective than petrolatum for severe dryness.
"The single most important intervention for eczema management is consistent, adequate moisturization. Not just any moisturizer — one that contains the right balance of humectants, emollients, and occlusives applied at least twice daily, and more frequently during flare-ups. The right moisturizer can reduce the need for topical corticosteroids by 30 to 50 percent over time."
Wet Wrap Therapy
Wet wrap therapy is a technique used for moderate to severe eczema flare-ups, typically under medical supervision. The method involves applying a moisturizer or topical medication to affected skin, covering the area with a layer of damp cotton clothing or bandages, and then adding a dry layer on top. The damp layer increases absorption of the treatment, provides intense hydration to the barrier, and creates a cooling effect that relieves itching.
Wet wraps are typically applied for 2 to 12 hours, often overnight. They are particularly effective for severe flare-ups that have not responded to standard treatments. However, wet wraps should not be used on infected skin, and prolonged use without medical supervision can increase the risk of skin infections and corticosteroid absorption. Always consult a dermatologist before starting wet wrap therapy.
Building an Eczema Skincare Routine
A consistent, gentle routine is essential. Cleanse with a cream or oil-based cleanser that does not strip the barrier. Use lukewarm water and pat the skin dry rather than rubbing. Apply moisturizer within three minutes of bathing, while skin is still damp, to lock in moisture. Use a ceramide-rich moisturizer with the optimal 3:1:1 lipid ratio during the day and a petrolatum-based ointment at night for intensive repair. Choose products with the National Eczema Association Seal of Acceptance for reliable identification of eczema-safe products. For more on building a routine for sensitive skin, see our guide on rosacea-friendly skincare.
