Oily skin. Dry skin. Combination skin. Sensitivity.
None of that matters much once El Niño hits.
Every few years, El Niño skin overrides almost every skin type at once. Rising heat pushes sebaceous glands to produce more oil, no matter your baseline. Falling humidity pulls moisture out of every skin barrier just as fast, even skin that's normally never dry. The result: most people end up with the same oily-and-dehydrated condition, regardless of what they'd normally call their "type."
What is "El Niño skin"?
El Niño is a climate pattern that raises sea surface temperatures in the Pacific. In Malaysia and Singapore, El Niño years typically bring hotter days and longer dry spells. Skin reacts to both changes at once.
Higher heat triggers your sebaceous glands to work harder. Lower humidity in the air pulls water out of your skin faster than usual. The result is skin that looks shiny and feels tight in the same afternoon. This combination is sometimes called oily dehydration. Skin overproduces oil to compensate for a lack of water underneath.
El Niño skin is a temporary stress response, not a fixed skin type.
Why does heat make skin oilier?
Sebaceous glands sit just below the skin's surface and produce sebum, the natural oil that keeps skin supple. Heat increases blood flow to these glands. More blood flow means more sebum output. This happens whether your skin usually runs oily or dry.
Sweat adds to the problem. When sweat mixes with excess sebum, pores clog more easily. This raises the risk of breakouts and clogged pores.
Signs of heat-triggered oiliness:
- Shine returning within hours of cleansing
- Enlarged, more visible pores
- New breakouts along the forehead, nose and chin
- Makeup sliding off faster than usual
Skin prone to this cycle benefits from a lightweight, oil-controlling formula that doesn't strip the barrier. Our Super-Clear Treatment Essence is built for this, helping rebalance sebum while supporting the skin barrier.
Remember evaporation in your science class?
When humidity drops, dry air pulls moisture out of anything nearby, including your skin. This constant water loss through the skin has a name: transepidermal water loss, or TEWL. In simple terms, it's how fast your skin loses water into the air.
Higher temperatures speed up water evaporation from the skin's surface. So even on a hot day, low humidity can leave skin dehydrated underneath an oily top layer. Even skin that's normally never dry loses water this way.
Signs of hidden dehydration:
- Tightness after cleansing, even with oily patches nearby
- Fine lines more visible by midday
- Quick moisturiser absorption, followed by dryness again within hours
Dehydrated skin struggles to hold water on its own, so direct replacement matters more than usual. Our Super-Moist Treatment Essence uses hyaluronic acid at several molecular weights. This lets it refill water at different skin depths instead of sitting on the surface.
How does this affect your skin microbiome?
Your skin microbiome is the community of bacteria, fungi and other microorganisms living on your skin's surface. It depends on a stable environment to stay balanced.
Excess oil combined with water loss disrupts that balance. Good bacteria that thrive on a well-hydrated barrier start to struggle. Bacteria linked to inflammation and breakouts can multiply faster in oil-rich conditions. This imbalance is known as dysbiosis.
Dysbiosis makes skin more reactive. Breakouts often worsen and the barrier takes longer to repair. Supporting the microbiome, not just controlling oil or adding moisture, is central to breaking this cycle.
What can you do about oily, dehydrated skin?
Whatever your usual skin type, treat both problems together, not one after the other. A few adjustments make the biggest difference during El Niño conditions:
- Gentle, non-stripping cleanser, twice daily
- Hydrating treatment essence before any oil-control step
- Lightweight, water-based moisturiser over heavy cream
- Daily sunscreen, since UV also disrupts the skin barrier
- Consistent routine, without frequent switching
Small, consistent steps rebuild the skin barrier faster than aggressive oil control alone.
Explore our Oily/Acne and Hydration/Smoothness collections to find formulas built for exactly this paradox.