Dry or dehydrated skin: how to recognize them and take care of them

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Often, due to hormonal fluctuations, internal factors, or sudden temperature changes, facial skin starts to feel tight and looks dull and irritated. The terms dry skin and dehydrated skin are used interchangeably, but they mean two different things: the former is a skin type lacking lipids, while the latter is a temporary condition caused by a lack of water in the tissues.

Recognizing the difference is the first step to avoiding the wrong purchase. Let’s look at how to tell them apart and how to build the right routine.

The difference between dry and dehydrated skin

What is dry skin?

It is a skin type, like oily, normal, or combination skin. The skin produces little lipids and sebum, so its protective film is less substantial and struggles to retain moisture.

It is a constitutional condition that can worsen at certain times—cold, wind, harsh cleansers—and that cannot be resolved with just any moisturizer. A lack of lipids in the stratum corneum increases transepidermal water loss (TEWL) and makes the skin thinner and more vulnerable to external irritants.

It is recognized by:

• Visible flaking, peeling skin, and a rough texture to the touch;
• A tight feeling, especially after cleansing;
• Itching or burning, sometimes with localized redness;
• Reduced elasticity and a dull complexion.

When dryness is pronounced, micro-cracks can appear, and the skin is easily irritated by contact with cold, wind, or harsh products.

Dryness can also appear only in certain areas: the most common is around the nose, where friction and temperature fluctuations put a small, already delicate area to the test.

What is dehydrated skin?

It is a temporary condition caused by a lack of water in the tissues, and can affect any skin type, including oily or combination skin. It is not dryness in the strict sense, but skin that is temporarily dehydrated due to stress, climate, overly stripping cosmetics, or an unbalanced routine.

Precisely because it involves water and not lipids, it is reversible: targeted skincare can improve the situation.

The signs are similar—tight, rough skin—but with fine dehydration lines, especially around the eyes, and a grayer complexion.

The case that causes the most confusion: oily skin can also be dehydrated. It looks shiny in the T-zone, but feels tight after cleansing and shows fine lines and flaky patches. This is why treating it as "just oily" with oil-stripping products makes things worse. Read more in our guide to an oily skin routine.

How to tell if your skin is dry or dehydrated: two tests

Two at-home tests, done one after the other, give a fairly clear answer without needing any tools.

1. The ten-minute test. Cleanse your face, pat it dry with a clean towel, and don't apply anything for ten minutes. If you notice flaking and widespread roughness, dryness is more likely; if your skin feels tight but remains smooth to the touch and shows fine lines, dehydration is more likely.
2. The pinch test. Gently pinch a small area of skin on your cheekbone and release it. If it springs back into place immediately, your hydration level is good; if the mark remains for a moment and fine lines are still visible, your skin is lacking water.

The third clue comes from looking in the mirror in the middle of the afternoon: dry skin stays dull and lacks radiance, while dehydrated skin can have a shiny T-zone and visible pores despite feeling tight. This is the typical hallmark of dehydrated oily skin.

In most cases in winter, the two conditions coexist: skin that's naturally dry and also losing water. The routine doesn't change in principle, only in order: first replenish water with humectants, then seal it in with a richer texture. Skipping the second step is the mistake that makes the first one pointless.

The natural moisturizing factor: what your skin does on its own

Before adding anything from the outside, it's worth knowing that the stratum corneum already has its own moisturizing system, the Natural Moisturizing Factor. It's a group of hygroscopic substances produced by the breakdown of filaggrin: free amino acids, pyrrolidone carboxylic acid, lactates, and urea.

It's worth knowing for two very practical reasons. First, it explains why some ingredients work better than others: urea and amino acids are already part of that system; they don't just imitate it. Second, the NMF is water-soluble, so harsh cleansing washes it away along with dirt.

That's why, before buying a new moisturizer, the right question is something else: what's your cleanser like? If your skin feels tight after washing, the problem starts earlier in your routine, and no cream can fully make up for it.

Causes of dry and dehydrated skin

Dry skin: causes

Dry skin is often genetic: some people naturally produce fewer lipids. Over time, skin aging, hormonal imbalances such as menopause, and conditions such as atopic dermatitis or psoriasis can further weaken the skin barrier.

A note about the two conditions just mentioned: atopic dermatitis and psoriasis are dermatological conditions, not simple dryness. A well-chosen emollient routine improves comfort and tolerance and is often recommended as supportive care, but diagnosis and treatment are up to a dermatologist. If flaking persists, has clearly defined edges, or is accompanied by intense itching, that's the right next step.

Dehydrated skin: causes

Dehydrated skin doesn't depend on skin type, but on what's happening around it. The most common causes, ranked by their practical impact:

• Improper cleansing: overly harsh cleansers, hot water, and repeated washing strip away the natural moisturizing factor, which is water-soluble.
• Over-exfoliation: acids, retinoids, and scrubs used too often thin the stratum corneum and increase its permeability. For guidance on frequency and products, see this guide on how to exfoliate your skin without damaging it.
• Dry air and temperature fluctuations: heating, air conditioning, wind, and cold cause water to evaporate from the surface, as explained below.
• Lifestyle: insufficient sleep, smoking, alcohol, and a diet low in water and healthy fats.
• Prolonged stress: it affects the synthesis of barrier lipids and intensifies the feeling of tightness, even in people who have never had dry skin. The mechanism is explained in the article on stress and dry skin.
• An unbalanced routine: using only mattifying products on oily skin, or using humectants without anything on top to seal in the water.

The practical difference compared with naturally dry skin is that every cause on this list can be corrected. That's why dehydration is reversible: remove the cause, replenish the water, and the skin goes back to retaining it on its own.

What happens to the skin barrier

The skin barrier works like a brick wall — the cells are the bricks, and the lipids are the mortar. When the structure weakens, the skin becomes more permeable and water evaporates more easily. To understand how this mechanism fits into the overall structure of the skin, see the guide on how skin is structured and how it works. Air pollution also contributes: particles oxidize the barrier's lipids and proteins, making it less compact.

Mistakes that make things worse

Before adding products, it's worth dropping the habits that fuel the problem. There are four, and they're all counterintuitive because they come from wanting to do more.

1. Cleansing too often or for too long. Every wash removes some of the protective sebum. For dry skin, twice-daily cleansing is the maximum, and in the morning, water alone is often enough.
2. Using hot water. It dissolves surface lipids and leaves the skin worse off than before. Always use lukewarm water.
3. Exfoliating to remove flaky skin. This is the most common mistake: flaking is a symptom of a compromised skin barrier, and scrubbing it off compromises it further. Rebuild the barrier first, then exfoliate if needed.
4. Changing moisturizers every week. A damaged skin barrier takes two or three weeks to rebuild. If you switch sooner, you don't give any product enough time to work.

There's a fifth mistake that almost no one associates with the face, and it concerns the body: the first two points on this list apply just the same in the shower, where the area involved is much larger and the routine is daily. Taking care to cleanse your face and then washing your body with scalding water and a harsh cleanser is counterproductive. For advice on how to choose — and what really sets one product apart from another — read the article on shower gel, bath foam and body wash.

The L setting matters more than it seems

There's a factor that doesn't involve the skin but affects it every day in winter: dry air in heated indoor spaces. When air is heated, its relative humidity drops, and the skin loses water through simple evaporation.

The data are clear. In a clinical study conducted in Korea, six hours in a heated environment with relative humidity below 20% were enough to cause a statistically significant increase in facial roughness, pores, redness, and visible wrinkles, as well as transepidermal water loss on the forearm. Six hours, on healthy skin. It is also known that sharp drops in ambient humidity disrupt barrier homeostasis, and that room humidity affects the formation of fine lines on the face.

The practical takeaway: a humidifier in the bedroom addresses the cause, while moisturizer addresses the effect. It's not accurate to say it replaces skincare products — in the Korean study, the ceramide cream improved elasticity, pores, and skin texture compared with the untreated side — but focusing only on the skin in a room with very low humidity means chasing the problem. The two go hand in hand.

Ingredients to look for in the INCI

The distinction between the two conditions becomes clear right here, when you look at the ingredients list. Every moisturizing ingredient does one of three different things, and none of them is enough on its own: that's why well-formulated products combine at least two.

Humectants — work on dehydration:

• Hyaluronic acid, which is more effective when the same formula contains a range of molecular weights;
• Glycerin, the most widely studied humectant and the most stable over time;
• Urea, which is part of the skin's natural moisturizing factor and also softens rough areas at low concentrations.

One detail almost no one explains: in a very dry environment, a humectant can draw water from the deeper layers of the skin rather than from the air. On an intact skin barrier, this effect is negligible; on a barrier that is already damaged, and without anything on top to seal it in, it can worsen the feeling of tight skin. This is the technical reason why a hyaluronic acid serum used on its own in winter can sometimes disappoint.

Emollients and occlusives — work on dryness:

• Shea butter and plant oils rich in essential fatty acids;
• Squalane and ceramides, which rebuild the "mortar" between the cells of the stratum corneum;
• Vitamin E, which protects the lipids just replenished from oxidation.

The routine for dry and dehydrated skin

Cleansing

L's goal is to avoid the feeling of tight skin. A oil-based cleanser is best, as it removes makeup and dirt by affinity without stripping the hydrolipidic film. Rinse with lukewarm water, never hot.

Serums and targeted treatments

In the morning, Lycoglow Serum brightens and provides antioxidant protection against environmental aggressors, improving hydration and reducing flaking thanks to mullein and lycopene.

If the main issue is dehydration, when your skin feels tight even if it's oily or combination, Hyaluron 8 Hydra Deep works specifically with humectants: 8 forms of hyaluronic acid with different molecular weights and an NMF system with urea, Sodium PCA and panthenol, which rebuilds the natural moisturizing factor. Always apply a cream over it.

In the evening, if your skin is particularly stressed, a night serum based on plant oils supports the lipid component during overnight renewal.

Once or twice a week, or as an SOS treatment when your skin looks dull and rough, the mask delivers a concentrated dose of active ingredients.

During the day, when you feel your skin starting to feel tight, a spray of thermal water provides minerals and immediate relief.

Face cream

This is the step that finishes the routine, sealing in water and active ingredients while adjusting lipid levels. This is where the initial distinction becomes practical. For criteria to consider when choosing a product, see the guide on how to choose a face cream for dry skin.

If your skin is dehydrated, it needs help retaining water: Hyaluronic Advance works with hyaluronic acid in different molecular weights.

If your skin is dry and also needs support for tone and elasticity, Alba provides more enveloping nourishment, ideal in winter or in very dry environments.

If dryness is accompanied by sensitivity, it’s better to choose a soothing formula.

You can find the full range in the LeLang selection of hydrating facial treatments, designed around this very principle: humectants and lipids working together, rather than a single star active ingredient repeated in every formula.

If you’d rather have your skin assessed before choosing among these three options, you can find LeLang products and expert advice at partner pharmacies throughout Italy.

In conclusion

Distinguishing between dry and dehydrated skin is the first step toward an effective routine. Dryness calls for a targeted supply of lipids; dehydration requires molecules that can retain water in the tissues. And when both conditions occur together — the most common case in winter — you don't have to choose: you just need to follow the right order.

The rest comes down to consistency, along with the habit of adapting your routine to the season: we discuss this in our article on how to prepare your skin for winter.

Sources for this article

01 Park E.H., Jo D.J., Jeon H.W., Na S.J., Effects of winter indoor environment on the skin: Unveiling skin condition changes in Korea, Skin Research and Technology, 2023; 29(6): e13397.
02 Sato J., Denda M., Chang S., Elias P.M., Feingold K.R., Abrupt decreases in environmental humidity induce abnormalities in permeability barrier homeostasis, Journal of Investigative Dermatology, 2002; 119(4): 900-904.
03 Tsukahara K., Hotta M., Fujimura T., Haketa K., Kitahara T., Effect of room humidity on the formation of fine wrinkles in the facial skin of Japanese, Skin Research and Technology, 2007; 13(2): 184-188.
04 Rawlings A.V., Harding C.R., Moisturization and skin barrier function, Dermatologic Therapy, 2004; 17(Suppl 1): 43-48.
05 Verdier-Sévrain S., Bônté F., Skin hydration: a review on its molecular mechanisms, Journal of Cosmetic Dermatology, 2007; 6(2): 75-82.

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