Everything I try irritates my skin

There's an important distinction between skin that is genetically sensitive — eczema-prone, rosacea-prone, reactive from birth — and skin that has become sensitised over time. The second category is more common than most people realise, and it's almost always acquired.

Sensitised skin develops when the barrier is disrupted repeatedly and not given sufficient time or conditions to repair. Over-cleansing, over-exfoliating, and using high-concentration actives without allowing recovery are common triggers. But so is chronic cortisol elevation — which is where the internal picture comes in.

The skin barrier is maintained by a mix of lipids, proteins, and moisture-retaining compounds. Cortisol directly reduces the synthesis of ceramides — one of the key lipid components — and compromises tight junction proteins that hold the barrier together.

In a state of chronic stress, cortisol is persistently elevated. This means the barrier is chronically under-resourced. It becomes thinner, more permeable, and slower to recover from each insult. Products that would have been tolerated easily before may now trigger reactions, not because the product has changed but because the barrier is in a different state.

This also explains why sensitive skin often appears during or after a stressful period — and why calmer periods can bring notable improvement even without product changes.

For a cortisol-reactive barrier, the instinct to try more products is counterproductive. Less is almost always more: fewer products, lower actives, more barrier support (ceramides, fatty acids, humectants), and a longer stabilisation period before introducing anything new.

But the more important shift is internal. Sleep quality, nervous system regulation, and inflammatory load all directly affect barrier recovery speed. Skin that becomes significantly calmer during low-stress periods isn't responding to a different product — it's responding to a different cortisol level.