Somewhere between the rise of slugging and the fall of 10-step routines, #TikTokBeutyTrends has arrived at its most unhinged skin care proposition yet. The premise: smear nappy rash cream – yes, the paste designed for the tenderest of newborn behinds – across your very grown, very expensive-skin care-having face, and wake up glowing. Millions of views. Countless converts. A single, slightly absurd question hanging over the beauty world: has Gen Z genuinely cracked the code on skin barrier repair, or have we simply run out of new things to put on our faces?
For answers, we went to April Brodie, one of Australia’s most sought-after integrated facialists – a woman who has, presumably, seen every version of “I tried it so you don’t have to” that the internet can produce, and who approaches this one with the measured amusement of someone who has heard it all before.
The truth, the whole truth and nothing but the truth
“Zinc oxide is a legitimate skin-supporting ingredient,” Brodie concedes, before delivering the caveat that separates the credible from the chronically online: nappy creams are engineered for infant skin, which spends its days marinating in moisture and friction and needs a thick, occlusive shield against the elements. Adult facial skin, meanwhile, has an entirely different pH, oil output and agenda. If your skin barrier happens to be compromised, you may well notice something calmer and more comfortable in the morning – but that’s the zinc oxide clocking in for its shift, not the diaper cream performing some secret, baby-exclusive alchemy. A well-formulated facial product with the same active ingredient, Brodie notes, will do the job without the heaviness.
In other words: the effect is real. The “hack” framing is where things get a little theatrical.
So what is zinc oxide actually doing under there?
Quite a lot, as it happens. It’s both protective and anti-inflammatory, forming a physical barrier that curbs water loss while fending off external irritants, with mild antimicrobial properties for good measure – which is also why it turns up in mineral sunscreens. For skin that’s reactive or compromised, that’s a genuinely soothing combination. The catch is formulation: the zinc oxide in a nappy cream and the zinc oxide in a facial serum are chemically identical, but the vehicle carrying it is not. One is built to sit heavily on the skin and repel moisture at all costs; the other is calibrated for a face that already knows how to regulate itself, and simply needs a little support to keep doing so.
Which is precisely why this is not, Brodie is careful to point out, a trend for everyone. Oily or acne-prone skin types should proceed with caution, since the occlusive base can tip straight into congestion, and anyone prone to fungal acne should scrutinise the ingredient list, as certain oil-containing formulas can aggravate the condition. Her advice for rosacea-prone skin is the same advice she’d give for most viral trends: patch test before you commit your whole face to the bit.
The bigger story here isn’t diaper cream. It’s the skin barrier.
“Skin barrier repair” has become the industry’s favourite phrase to whisper meaningfully at dinner parties, and Brodie thinks that’s earned. After years of collective devotion to retinoids, acids and enthusiastic exfoliation, plenty of people are now living with the fallout: sensitivity, flare-ups, skin that stings at products it once tolerated without complaint. It’s also part of why Korean skin care philosophy – barrier preservation over aggressive correction, patience over quick fixes – has found such a devoted global audience. The telltale signs of a barrier in distress, per Brodie, go beyond the obvious tightness and redness: unexplained breakouts (often mistaken for acne and treated with exactly the wrong, harsher approach) and a certain dullness, since healthy skin reflects light and compromised skin simply stops trying.
Her prescription for keeping that barrier intact is, admittedly, less shareable than a diaper cream close-up: a gentle, pH-balanced cleanser, a moisturiser built on ceramides and fatty acids, daily SPF without exception, restraint with exfoliation, and – the least glamorous ingredient of all – sleep. “The basics simply aren’t as exciting as viral skin care trends,” she says, which may be the most quietly damning review a TikTok trend has ever received.
Before your next detour into skin care-as-performance-art, Brodie’s ask is simple: consider who’s dispensing the advice, what qualifies them to give it, and whether their skin bears any resemblance to yours. Social media, she notes, is wonderful at generating ideas and rather poor at supplying the context to know whether they’re right for you. Patch test. Introduce slowly. And if in doubt, consult someone whose job it is to actually know your skin – not just its follower count.
As for the myth she’d most like retired? That more is always better. More products, more actives, more steps rarely add up to better skin. It tends to add up to an overwhelmed one. The glow, as it turns out, was never hiding in the diaper aisle. It was hiding in consistency – which, unfortunately, does not make for a very compelling 15-second video.