What causes dry skin, and how to fix it

In most cases, dry skin is a shortage of water in the outer layer and a weakened skin barrier, not simply a lack of oil. That is why even someone with oily skin can experience surface dryness, tightness and flaking. Understanding this difference is the key to what causes dry skin and how to treat it: a genetically dry skin type needs a different approach from passing dehydration. This guide explains the symptoms and causes, the important difference between dryness and sensitisation, and how to moisturise in a way that lasts. It helps to understand the various causes of skin dryness first, so you treat the root rather than the symptom.

The good news is that most dryness improves with a simple, correct routine. The realistic news is that random moisturising with too many products can make things worse if it keeps disrupting the barrier instead of repairing it.

Dry skin symptoms: how to recognise them

Before treating anything, learn the signs. Dry skin symptoms are usually easy to recognise and vary in intensity from one person to another:

Symptom	How it shows	What it points to
Tightness	A pulling feeling, especially after washing	Low moisture, weak barrier
Flaking	Fine flakes or a rough texture	Water loss from the surface
Dullness	Loss of a healthy glow	Build-up of dry dead cells
Fine lines	Surface lines that ease with moisture	Under-plumped cells
Mild itch	An urge to scratch without strong redness	Early surface irritation

The rule: passing surface symptoms point to dryness that responds to moisture, whereas redness, burning and strong itch may point to something beyond dryness.

What causes dry skin

The causes of dry skin are often external and adjustable, which is exactly what makes treatment possible. The main ones are:

Harsh washing: strong cleansers, ordinary soap and hot water remove natural oils and weaken the barrier.
Weather: dry, cold air, heating and air conditioning pull moisture out of the skin.
Over-exfoliating: frequent scrubs strip the protective layer faster than it can renew.
Age: oil production and the ability to hold water both decline naturally over time.
Strong actives: some products, such as retinol and acids, can dry the skin if used without enough moisture.

The moisture-loss cycle

When the barrier weakens, the skin falls into a loop where dryness feeds itself:

graph TD
  A[Weak skin barrier] --> B[Water evaporates away]
  B --> C[Dryness and flaking]
  C --> D[Tiny cracks in the barrier]
  D --> E[Irritants get in, irritation rises]
  E --> A
  C --> F[Barrier-repairing moisture breaks the loop]
  F --> G[Barrier recovers and holds water]

Dry skin vs sensitised skin

This distinction really matters, because it decides the treatment. The difference shows up in the nature of the symptoms: dryness is a shortage of water that appears as tightness, flaking and dullness, and it improves with moisture. Sensitisation is an inflammatory reaction that appears as redness, burning and strong itch, sometimes a rash or swelling, and it needs the trigger stopped rather than just more moisturiser.

Marker	Dry skin	Sensitised / irritated skin
Dominant feeling	Tightness and roughness	Burning, stinging and itch
Colour	Dullness and flaking	Clear redness
Trigger	Low water, weak barrier	An irritant or allergen
First step	Barrier-repairing moisture	Stop the trigger and calm

If your skin burns and reddens strongly, it is more likely sensitised than simply dry, and the approach differs.

How to moisturise dry skin the right way

Moisturising dry skin is not just applying a cream; it is a two-layer strategy. First a water-attracting ingredient (a humectant) such as hyaluronic acid or glycerin, applied to slightly damp skin to draw water in. Second a sealing moisturiser (an occlusive or emollient) with ceramides, butters or gentle oils to stop that water evaporating.

The practical key is timing: apply the moisturiser within minutes of washing while the skin is still damp, because that traps moisture instead of letting it escape. Swap a harsh cleanser for a gentle, soap-free one, and hot water for lukewarm. Our guide to choosing a gentle facial cleanser helps you pick one that protects the barrier.

The order is not a detail. A humectant on its own, in dry air, can pull water up from deeper in the skin only for it to evaporate off an unsealed surface, leaving skin drier than before. That is why the sealing layer on top is not optional for genuinely dry skin — it is the half of the strategy that makes the first half worth doing.

Why dry skin looks worse in some seasons

Dryness rarely stays constant through the year, and that is a clue in itself. In cold months the air holds less water, indoor heating dries it further, and the swing between a warm room and cold air outside stresses the barrier repeatedly. In hot climates, long hours in air conditioning do much the same thing by keeping the surrounding air dry.

None of these change your underlying skin type, but they raise how much water your skin loses each day. If your dryness flares predictably with the weather or with more time indoors, that points to an environmental driver you can offset — a richer sealing cream in winter, a humidifier in an air-conditioned room, and shorter, cooler showers — rather than a deeper medical cause. If the dryness reaches your hair as well as your skin, the shared causes of dry skin and hair may be behind both.

What happens if dry skin is ignored

Neglecting dryness worsens the problems of dry skin and makes them harder to treat. A weak barrier lets irritants in, which raises irritation and sensitivity, flaking can progress to cracks, and fine lines look more obvious. Dry skin is also more prone to redness and reactions to products.

Prevention is simpler than treatment: a gentle, consistent routine, regular moisturising and daily sunscreen to protect the barrier are usually enough to keep dryness under control. Consistency matters more than the number of products — a barrier repairs over days and weeks, not overnight, and it responds far better to the same few gentle steps repeated than to a shelf of actives swapped in and out. If you only change one thing, protect the barrier and give it time. If dryness is already entrenched, how to treat dry skin sets out the fuller repair routine.

Frequently asked questions

What is the difference between dry skin and dehydrated skin?

Dry skin is a genetic skin type whose glands make permanently less oil. Dehydration is a temporary state, meaning a shortage of water in the outer layer, and it can affect any skin type, even oily. The first needs barrier-repairing oils and lipids; the second needs water-based hydration and something to seal the moisture in.

What are the main symptoms of dry skin?

The most common symptoms are tightness, especially after washing, along with flaking, roughness, a dull tone and fine surface lines. You may feel a mild itch at times. If the itch grows or clear redness and burning appear, the problem may be sensitisation rather than simple dryness.

How do I moisturise dry skin correctly?

Effective moisturising is two layers: a water-attracting ingredient such as hyaluronic acid or glycerin on slightly damp skin, then a moisture-sealing cream with ceramides or butters. Apply the moisturiser within minutes of washing to trap water, and use a gentle cleanser and lukewarm rather than hot water.

When is dry skin a sign of a health problem?

Severe, persistent dryness despite regular moisturising, or dryness with cracking, strong itch or inflammation, can be linked to skin conditions such as eczema or to internal causes. If dryness does not improve within weeks of correct care, or comes with other symptoms, a medical assessment is the safe step.

When to see a dermatologist

If your skin stays severely dry despite a correct moisturising routine for weeks, or comes with cracking and strong itch or redness and inflammation, there may be a skin condition that needs a diagnosis. Every skin has different needs, and a medical assessment distinguishes simple dryness from a condition such as eczema that needs prescribed treatment. At InJasmine we help you build a routine that fits your skin type instead of relying on trial and error.