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Slugging: The Occlusive Skincare Technique Explained

What Is Slugging?

Slugging = applying a thin layer of an occlusive ointment (petrolatum/Vaseline®, Aquaphor®, CeraVe Healing Ointment) as the final step of your PM routine to seal in hydration and repair the stratum corneum barrier. Originated in K-beauty; popularized on social media.

How It Works

Petrolatum reduces transepidermal water loss (TEWL) by >98% — the gold standard occlusive. It doesn't add moisture; it traps the humectants (hyaluronic acid, glycerin), emollients (ceramides, squalane), and your skin's own water applied underneath.

Evidence-Based Benefits

  • Barrier repair: Accelerates recovery from retinoid irritation, chemical peels, winter xerosis, eczema flares.
  • Hydration retention: Increases stratum corneum water content 20–30% overnight.
  • Reduced irritation: Buffer against environmental aggressors (wind, low humidity, indoor heating).
  • Acne adjunct: Contrary to myth, non-comedogenic petrolatum (purified) doesn't clog pores. By repairing the barrier, it reduces compensatory sebum overproduction. Patch test first.

Who Should Avoid or Be Cautious

  • Active inflammatory acne (pustules, nodules) — occlusion may worsen.
  • Rosacea flare — heat trapping can trigger flushing.
  • Perioral dermatitis — occlusives are a known trigger.
  • Fungal folliculitis (Malassezia) — feeds on lipids.
  • Extremely oily skin in humid climates — may feel suffocating.

Pro Protocol

  1. Cleanse (double cleanse if sunscreen/makeup).
  2. Treat (retinoid, acids, prescription) — wait 20 min if retinoid.
  3. Hydrate (HA serum + ceramide moisturizer).
  4. Slug: Pea-sized petrolatum warmed between fingertips; press (don't rub) over face ± neck.
  5. Sleep on silk pillowcase (reduces transfer, friction).
  6. AM: Cleanse thoroughly (oil cleanser → gentle wash) to remove residue.

Frequency & Customization

  • Dry/barrier-compromised: Nightly × 2–4 weeks, then 2–3×/week maintenance.
  • Normal/combo: 1–2×/week or as needed (post-flight, post-peel, winter).
  • "Micro-slugging": Mix 1 drop facial oil into moisturizer — lighter occlusion.

Myth bust: Petrolatum is highly refined (USP grade), non-comedogenic (0/5 scale), non-allergenic, and does not "suffocate" skin — skin doesn't breathe; it respires via blood supply.

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