Petrolatum Occlusion / Overnight Moisturising Technique
A skincare technique involving the application of a thin layer of an occlusive agent — traditionally petrolatum (Vaseline) but also substituted with thick balms or oils — as the absolute final step of a PM skincare routine. The occlusive layer dramatically reduces overnight transepidermal water loss (TEWL), creating a sealed environment that intensifies the moisturising effect of all underlying products. Originating from Korean and Filipino beauty traditions, popularised globally via TikTok circa 2021.
Best for dry, dehydrated or barrier-compromised skin. Those with oily or acne-prone skin should approach with caution as occlusives can trap sebum and potentially worsen congestion. Not ideal for humid environments. Apply an extremely thin layer — just enough to create a slight sheen.
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