Heat doesn't just make you sweat. It dilates blood vessels, raises oil production and weakens the barrier, so skin looks flushed, congested or reactive even when nothing else has changed.

The instinct is to do more. The answer is to do less. This week skin needs cooling, hydration and protection, not heavy actives on an already stressed barrier.

So I ease off anything aggravating, keep hydration high, and never skip SPF. That's the whole strategy for a week like this.

Dr Ellie Sateei, Cosmetic and Regenerative Doctor