What Is Slugging? The Overnight Glow Hack (2026)
Scroll any skincare feed and you will see it: people smearing a shiny layer of petroleum jelly over their face before bed and waking up positively glowing. It is called slugging, and behind the slightly gross name is a genuinely effective (and nearly free) trick for dry, thirsty skin.
But it is not for everyone, and doing it wrong can clog you up. Here is what slugging actually is, who should try it, and how to do it without breaking out.
Slugging does not add moisture — it locks in the moisture already there. That distinction is everything.
What Slugging Is
Slugging is the practice of applying a thin layer of an occlusive — usually petroleum jelly — as the very last step of your night routine. An occlusive forms a seal on top of the skin that drastically slows transepidermal water loss (the moisture that escapes overnight).
It does not hydrate by itself; it traps the water and products already on your skin so they work harder while you sleep. The result is soft, plump, dewy skin by morning — hence the slug-like glow it is named after.
How to Slug Correctly
- Cleanse gently and pat almost dry — slightly damp skin is ideal.
- Hydrate and moisturize as normal — a hydrating serum then your usual moisturizer.
- Apply a thin layer of occlusive (petroleum jelly or Aquaphor) over the top. A little goes a long way.
- Wake up, cleanse it off in the morning, then your normal AM routine and SPF.
Who Should (and Should Not)
Great for: dry, dehydrated, flaky or wind-chapped skin, and barrier repair after over-doing actives. It is a winter hero. Be cautious if: you have oily, congestion-prone or acne-prone skin — sealing everything in can trap oil and trigger breakouts. If that is you, slug only on dry patches, or skip it.
Dry skin loves slugging. Oily skin should treat it with caution — or skip the cheeks and chin entirely.
Mistakes to Avoid
Do not slug over strong actives — sealing retinoids or acids in can amplify irritation. Use slugging on plain hydrating nights only. Do not slug dirty skin — you will trap oil and grime. Do not use too much. And watch for congestion — if you start breaking out, slug less often or stop.
Frequently Asked Questions
What is slugging in skincare?
Slugging means applying a thin layer of an occlusive (like petroleum jelly) as the last step at night to seal in everything underneath, so skin wakes up plump, soft and hydrated. The name comes from the slug-like sheen it leaves.
Is slugging good for your skin?
For dry, dehydrated or barrier-damaged skin, yes — it dramatically reduces overnight water loss. Oily and acne-prone skin should be cautious, as occlusives can trap oil and trigger congestion.
What do you use for slugging?
A bland occlusive such as petroleum jelly (Vaseline) or Aquaphor. Apply a thin layer over your normal moisturizer as the final night step.
Can slugging cause breakouts?
It can if you have oily or acne-prone skin, or if you slug over actives or unclean skin. Keep it to clean, dry skin, avoid layering over strong actives, and skip it if you break out.
The Bottom Line
Slugging is a cheap, effective way to wake up with soft, dewy skin — if your skin is on the dry side. Hydrate and moisturize first, seal with a thin layer of occlusive, and wash it off in the morning. Dry skin will love it; oily skin should tread carefully. Either way, it is one of the most budget-friendly glow hacks out there.
Want hydration built into your routine?
Our free Routine Builder maps an AM/PM routine — slugging-friendly — for your skin type.
Build my routine →Educational content — not medical advice. Patch-test, and avoid slugging over active treatments. Sources: American Academy of Dermatology (AAD) and peer-reviewed dermatology literature.