Dry skin – clinically called xerosis – affects a large proportion of the adult population and becomes more common with age. While it often feels like a cosmetic inconvenience, persistent dryness indicates a compromised skin barrier, and managing it properly requires understanding what is actually happening in the skin, not just which moisturizer to buy.
This guide covers the evidence-based causes of dry skin, what ingredients genuinely help, and how to build a consistent morning and evening routine.
What Actually Causes Dry Skin – The Skin Barrier Explained
The outer layer of the skin (the stratum corneum) functions as a barrier that holds moisture in and keeps irritants out. It does this through a specific mix of lipids – primarily ceramides, cholesterol, and fatty acids – that fill the spaces between skin cells like mortar between bricks.
Xerosis occurs when this lipid matrix is depleted or disrupted, causing increased transepidermal water loss (TEWL) – water evaporating through the skin rather than staying in it. A 2019 review published in PubMed (PMID 31585489) confirmed a direct correlation between dry skin severity (conductance, roughness, scaliness) and the level of ceramides in the stratum corneum. Ceramides make up roughly 50% of all lipids in the epidermis; when they are depleted, the barrier breaks down and dryness results.
Common triggers for this depletion include:
- Hot water and harsh cleansers: Sulfate-based soaps and very hot showers strip lipids from the stratum corneum directly.
- Low humidity: Cold air holds less moisture; indoor heating further dries the air in winter, increasing water loss from the skin surface.
- Age: Ceramide production declines with age, and sebaceous gland activity also decreases, which is why people over 50 are more prone to xerosis.
- Genetics: Variants in filaggrin gene expression are associated with a structurally weaker skin barrier and are linked to atopic dermatitis.
- Medications: Diuretics, retinoids, and some blood pressure drugs (particularly certain ACE inhibitors) can cause or worsen dry skin as a side effect.
- Medical conditions: Hypothyroidism, atopic dermatitis, and psoriasis all involve barrier dysfunction and present with dry skin as a symptom.
What Ingredients Actually Help – The Evidence
The American Academy of Dermatology (AAD) recommends moisturizers containing ceramides, urea, glycerin, or lactic acid for treating xerosis. This is not a generic recommendation – each ingredient acts through a distinct mechanism:
- Ceramides: Directly replenish the lipid matrix. A 2022 qualitative review in the International Journal of Dermatology (PMC9293121) found that ceramide-containing formulations consistently improved transepidermal water loss, skin hydration, and skin pH in patients with dry skin and atopic dermatitis. A clinical trial published in PubMed (PMID 31585489) found that ceramide-containing moisturizers produced statistically significant improvements in skin hydration for up to 28 days after application.
- Glycerin and hyaluronic acid (humectants): Draw water from the dermis and environment into the outer skin layer. Glycerin is one of the most well-studied and cost-effective moisturizing agents available.
- Urea and lactic acid (keratolytics): Help remove excess dead skin cells that accumulate in xerosis, improving skin texture and allowing other ingredients to penetrate more effectively.
- Petrolatum and dimethicone (occlusives): Form a physical barrier on the skin surface that reduces water evaporation. Petrolatum is among the most effective occlusives known and is recommended by the AAD for severe dryness.
Products labeled as containing “ceramides 1, 3, and 6-II” have the strongest supporting data for barrier repair. Look for these on the ingredient list rather than relying on marketing claims.
Morning Routine for Dry Skin
Step 1 – Gentle Cleanser or Water-Only Rinse
Avoid foaming cleansers with sulfates (sodium lauryl sulfate or sodium laureth sulfate) in the morning. If your skin was not heavily soiled overnight, a plain water rinse is sufficient. If you prefer a cleanser, choose a cream or lotion formula containing glycerin or ceramides, and use lukewarm water – not hot. Pat dry with a soft towel, leaving skin slightly damp.
Step 2 – Hydrating Toner or Essence (Optional but Useful)
An alcohol-free hydrating toner or essence containing glycerin or hyaluronic acid adds a first layer of moisture to slightly damp skin. Apply by pressing gently into the skin rather than wiping. This step is especially useful in low-humidity environments.
Step 3 – Serum (Optional)
If you have specific concerns beyond dryness, this is where targeted serums go. For dry skin, niacinamide (vitamin B3) is well-evidenced to strengthen the skin barrier and reduce redness. Hyaluronic acid serums add hydration depth. Apply 2-3 drops and press into skin; wait 30-60 seconds before the next step.
Step 4 – Moisturizer
Apply a cream or lotion moisturizer containing ceramides, fatty acids, and a humectant such as glycerin, while skin is still slightly damp. This traps water in the skin rather than simply sitting on top of it. For very dry skin, look for products that list ceramides 1, 3, or 6-II on the label – these are the specific ceramide types with the strongest clinical data for barrier repair.
Step 5 – SPF Sunscreen
UV exposure damages the skin barrier and accelerates the ceramide depletion that drives dryness. SPF 30 or higher is the minimum recommended by the AAD. For dry skin, cream or lotion sunscreens work better than gel or spray formulas, and many now include ceramides or hyaluronic acid. Apply as the last step, every morning, regardless of season or cloud cover.
Evening Routine for Dry Skin
Step 1 – Oil or Balm Cleanser, Then Gentle Wash
For dry skin, the double-cleanse method works well in the evening. Start with a cleansing oil or balm to remove sunscreen, makeup, and excess sebum without stripping the skin. Follow with your gentle cream cleanser to remove any residue. Use lukewarm water throughout. Pat dry, leaving skin slightly damp.
Step 2 – Chemical Exfoliant (1-2 Times Per Week Only)
Physical scrubs create micro-tears in already compromised dry skin and are best avoided. Chemical exfoliants are more controlled. For dry or sensitive skin, lactic acid (an AHA) is preferable to glycolic acid because it exfoliates more gently and also functions as a humectant. Polyhydroxy acids (PHAs) are the gentlest option. Limit to once or twice weekly and always follow with extra moisturizer on exfoliant nights.
Step 3 – Hydrating Toner or Essence
As in the morning, apply an alcohol-free hydrating toner to damp skin. Evening is a good time to layer this step – two to three thin applications, allowing each to absorb, can meaningfully increase the baseline hydration level before your heavier products.
Step 4 – Treatment Serum
Evening is the better time for more active ingredients. Peptide serums support collagen production and barrier repair. Retinol (vitamin A) has the strongest evidence base for anti-aging effects but can increase skin sensitivity and dryness initially. If you use retinol, start at the lowest available concentration (0.025-0.05%) and use it no more than two to three nights per week until skin adapts. On retinol nights, be especially diligent with moisturizer afterward.
Step 5 – Face Oil (Optional)
Facial oils reinforce the lipid barrier and reduce overnight water loss. Squalane is lightweight and well-tolerated by most skin types. Rosehip seed oil contains natural retinoids (vitamin A compounds) and omega-6 fatty acids that support skin regeneration. Apply 3-4 drops by pressing into skin; allow a few minutes to absorb.
Step 6 – Rich Night Moisturizer or Occlusive
A ceramide-rich night cream or overnight mask provides the final layer. A 2023 clinical study published in PubMed (PMID 37930017) found that a ceramide-containing skincare routine significantly improved dryness symptoms in elderly patients with xerosis, with 93% of subjects showing no or minimal skin roughness after the observational period. For very dry skin, applying a thin layer of petrolatum (plain petroleum jelly) over the moisturizer as the last step creates an occlusive seal that prevents water from evaporating during sleep – a technique sometimes called “slugging” in consumer skincare discussions.
Seasonal and Environmental Adjustments
Dry skin typically worsens in winter because cold air holds less moisture and indoor heating further reduces humidity. Running a humidifier in your bedroom set to 40-60% relative humidity measurably reduces skin water loss. In winter, switch to richer moisturizer formulations and reduce exfoliation frequency to once a week or less.
In summer, a lighter moisturizer is acceptable if your skin feels comfortable, but do not skip moisturizer entirely on humid days – the barrier still needs support, and sunscreen remains mandatory. If you sweat heavily, reapplication of SPF is more important than eliminating the moisturizer step.
Diet and Hydration
Omega-3 fatty acids found in oily fish (salmon, mackerel, sardines), flaxseeds, and walnuts are building blocks for the lipid matrix in the skin barrier. Inadequate omega-3 intake is associated with dry, scaly skin. Vitamin E, present in sunflower seeds, almonds, and avocados, helps protect skin lipids from oxidative damage.
Drinking adequate water is often overstated as a dry skin remedy – dehydration severe enough to affect skin appearance is uncommon in otherwise healthy adults – but consistent hydration does support overall skin function. The more directly impactful change is what you apply externally and how you protect the barrier from damage.
When to See a Dermatologist
A consistent moisturizing routine using ceramide-containing products should produce noticeable improvement in mild to moderate dry skin within 4-6 weeks. If your skin does not improve, or if you experience cracking, bleeding, weeping, or intense itch, see a dermatologist. These symptoms can indicate eczema (atopic dermatitis), contact dermatitis, or psoriasis – conditions that require prescription treatment rather than over-the-counter moisturizers.
The AAD also recommends seeking evaluation if dry skin is accompanied by other systemic symptoms such as fatigue, weight changes, or excessive cold sensitivity, as these can indicate hypothyroidism, which is treatable but requires medical diagnosis.
This article is for general information and is not a substitute for professional medical advice.