Slugging
Slugging — the practice of applying a thin layer of an occlusive product, most often petrolatum, as the final step at night to seal in moisture. The occlusive forms a barrier that reduces water loss while you sleep, which can leave dry or compromised skin feeling more hydrated in the morning.
Key points
- It uses an occlusive such as petrolatum or a petrolatum-based balm as the last nighttime step.
- The occlusive layer slows transepidermal water loss rather than adding moisture itself.
- It is often favored by people with dry or barrier-compromised skin, especially in winter.
- Those prone to congestion may find heavy occlusives less suitable, and pairing them with strong actives can increase absorption and irritation.
Frequently asked
Should I put actives under an occlusive when slugging?
Occlusives can increase how much of an active penetrates, which may raise irritation, so many people avoid layering slugging over strong retinoids or acids.
Is slugging good for acne-prone skin?
It can help seal in hydration, but heavy occlusives may feel congesting for some acne-prone users, so tolerance varies by individual.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
