For teenage girls on TikTok, the makeup routine is an almost sacred ritual. Manicured fingertips dart around at virtuosic speed, applying dabs of foundation, blush and highlighter with precise artistry. Normally the commentary is about the nuances of brushing and blending – but Sophie, a bewitchingly pretty 18-year-old from New Zealand, has something more pressing to discuss.

‘I’d been having headaches for about two months,’ she says, placing dots of concealer under her blue eyes. ‘And then one night – it was my [high school] graduation – I was having a few drinks, which you’re not meant to do when you have glandular fever, which is what we all thought I had. So I kind of expected to wake up hungover.’

But this headache was worse than she’d ever had before, the painkillers weren’t workin

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