Slugging — the practice of coating your face in Vaseline before bed — has been viewed over 500 million times on TikTok and has become one of the most polarizing skincare trends of the decade. Some dermatologists endorse it. Others warn against it. Both sides have valid points.
The term comes from the shiny, slimy residue left on the skin — reminiscent of a slug trail. The concept is simple: apply an occlusive layer (petrolatum/Vaseline, Aquaphor, or CeraVe Healing Ointment) as the final step of your evening routine to seal in all the products underneath and prevent transepidermal water loss (TEWL) overnight.
But does it actually work? And more importantly, is it right for your skin? Let us examine the science behind slugging, who benefits, who should avoid it, and how to do it correctly if you decide to try it.
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Slugging is the practice of applying a thick layer of occlusive product — typically 100% petrolatum (Vaseline) or a petrolatum-based ointment — as the last step in your nighttime skincare routine.
The goal: create a physical barrier on the skin surface that prevents water from evaporating, forcing moisture and active ingredients deeper into the skin.
Occlusives function by forming a hydrophobic (water-repelling) film on the skin surface. This film physically blocks the evaporation of water from the stratum corneum (the outermost layer of skin).
Your skin constantly loses water through evaporation — this is called transepidermal water loss. A healthy skin barrier loses approximately 300–400 mL of water per day through the skin. Factors that increase TEWL:
Petrolatum (petroleum jelly, Vaseline) is the most effective occlusive ingredient available:
| Occlusive Ingredient | Reduction in TEWL | |---|---| | Petrolatum | >98% | | Dimethicone | ~80% | | Mineral oil | ~40% | | Shea butter | ~30% | | Jojoba oil | ~25% | | Squalane | ~20% |
This is not controversial. Petrolatum's occlusive properties are among the best-documented facts in dermatology. It has been used in medical settings for over 150 years — in wound care, burn treatment, and post-procedure recovery.
Yes. Despite internet rumors, cosmetic-grade petrolatum is safe. Here are the facts:
Slugging was essentially made for dry skin. If your skin feels tight, flaky, or rough in the morning, an occlusive layer overnight can dramatically improve hydration levels. Clinical studies show that petrolatum-based occlusion increases skin hydration by 30–50% within one week.
Retinol temporarily compromises the skin barrier, increasing TEWL and causing dryness, flaking, and irritation. Applying an occlusive layer over retinol significantly reduces these side effects without interfering with retinol's efficacy.
After chemical peels, microneedling, or laser treatments, dermatologists routinely recommend petrolatum-based ointments. Slugging is essentially the consumer version of this medical practice.
In environments with low humidity (heated indoor air, airplane cabins, arid climates), TEWL increases dramatically. An occlusive layer at night acts as a protective shield.
The "soak and seal" method — hydrating the skin and then locking it in with an occlusive — is a standard dermatological treatment for eczema. Slugging is the cosmetic application of this principle.
While petrolatum itself is non-comedogenic, the occlusive film traps everything underneath it — including sebum, bacteria, and dead skin cells. For acne-prone skin, this can create an environment that exacerbates breakouts.
The heavy texture can also feel suffocating on oily skin and may contribute to milia (small white bumps caused by trapped keratin).
Petrolatum itself does not feed Malassezia yeast. However, many petrolatum-based ointments contain additional ingredients (lanolin, mineral oil, certain esters) that can feed fungal acne. If you have fungal acne, use pure 100% petrolatum and check our Fungal Acne Guide for safe alternatives.
In tropical or humid environments, slugging can trap sweat and heat against the skin, potentially causing heat rash, increased bacterial activity, and breakouts.
If you are combination, consider partial slugging — apply the occlusive only on dry areas (cheeks, around the mouth) and skip the oily T-zone.
Slugging seals everything underneath. If you have residual dirt, makeup, or sunscreen, it gets trapped against your skin all night. Double cleanse: oil-based cleanser first, then water-based.
Serums and treatments go on bare, clean skin. Apply your retinol, vitamin C, niacinamide, or other actives as usual.
A humectant-rich moisturizer (with glycerin, hyaluronic acid) draws water into the skin. The occlusive layer on top prevents that water from evaporating.
Less is more. You do not need a thick mask. A pea-sized amount of Vaseline, warmed between your fingers, spread as a thin film over the face is sufficient. Focus on dry areas.
Petrolatum does not wash out easily. Use a pillowcase you can dedicate to slugging nights, or place a clean towel over your pillow.
| Skin Type | Frequency | |---|---| | Very dry skin | Every night | | Dry skin | 3–5 nights per week | | Normal skin | 1–2 nights per week | | Combination skin | 1 night per week, dry areas only | | Oily skin | Avoid or use lightweight alternative |
If full Vaseline slugging is too heavy, try these graduated alternatives:
Dimethicone is a silicone-based occlusive that provides ~80% TEWL reduction with a much lighter, more cosmetically elegant feel. Most modern moisturizers already contain it.
<!-- AFFILIATE: Dimethicone moisturizer -->Korean sleeping masks combine humectants, emollients, and light occlusives in a single product. They seal in moisture without the heavy feel of petrolatum.
<!-- AFFILIATE: Sleeping mask -->Plant-derived squalane (from olives or sugarcane) provides moderate occlusion (~20% TEWL reduction) with additional skin benefits. It absorbs more fully than petrolatum.
<!-- AFFILIATE: Squalane oil -->For maximum occlusion. Best for very dry skin, winter months, or post-retinol recovery.
<!-- AFFILIATE: Vaseline / Aquaphor -->Trapping dirt, bacteria, and old product against your skin overnight is a recipe for breakouts. Always double cleanse before slugging.
A thin film is sufficient. A thick layer is wasteful, messy, and uncomfortable. Start with a pea-sized amount.
Even dry skin may not need nightly slugging. Start with 2–3 nights per week and adjust based on how your skin responds.
Occlusives form a barrier. Nothing applied on top of Vaseline will penetrate through it. Actives always go UNDER the occlusive.
Some ingredients should NOT be sealed under an occlusive:
A 2022 study published in the Journal of Cosmetic Dermatology found that petrolatum-based occlusion increased stratum corneum hydration by 47% after 7 days and 62% after 14 days compared to non-occluded skin.
Research in the British Journal of Dermatology demonstrated that petrolatum accelerates barrier recovery by 40–60% after induced barrier disruption (tape stripping). This supports the use of slugging after retinol, exfoliation, or harsh weather exposure.
Petrolatum has been shown to improve wound healing outcomes by maintaining a moist wound environment. A meta-analysis of 28 studies found that moist wound healing with petrolatum was superior to dry healing in 89% of comparisons.
Yes. Aquaphor contains 41% petrolatum plus lanolin, glycerin, and bisabolol. It is slightly less occlusive than pure Vaseline but has additional soothing ingredients. Note: the lanolin in Aquaphor can cause reactions in lanolin-sensitive individuals and may not be suitable for fungal acne.
Technically yes, but it is not recommended. Petrolatum leaves a greasy residue that interferes with makeup application and sunscreen effectiveness. Morning occlusion also traps sweat and sebum produced during the day. Keep slugging for nighttime.
Petrolatum itself has a comedogenic rating of 0 (will not clog pores). However, the occlusive film can trap sebum, dead skin cells, and bacteria against the skin — which may contribute to breakouts in acne-prone individuals. The ingredient is non-comedogenic; the practice can be comedogenic for some skin types.
Yes, and many dermatologists recommend it. Tretinoin is significantly more irritating than OTC retinol. Applying an occlusive layer 20–30 minutes after tretinoin can reduce dryness and flaking without interfering with its efficacy.
Use an oil-based cleanser or a regular cleanser applied twice. Petrolatum is hydrophobic (water-repelling) so water alone will not remove it. An oil-based cleanser dissolves it effectively.
Yes. Petrolatum is inert and not absorbed into the bloodstream. It is one of the safest topical products available during pregnancy.
Slugging works — for the right skin type in the right circumstances. The science is clear: petrolatum is the most effective occlusive available, reducing transepidermal water loss by over 98%. For dry, dehydrated, or compromised skin, it can be transformative.
But slugging is not a universal solution. For oily and acne-prone skin, it can exacerbate the very problems you are trying to solve. And it is not a miracle treatment — it is simply an effective way to prevent moisture loss.
If you have dry or dehydrated skin, try slugging 2–3 nights per week. If you have oily skin, skip it entirely and focus on a lightweight gel moisturizer. And if you are somewhere in between, start with a lighter alternative like a dimethicone-based moisturizer or a sleeping mask.
The best skincare routine is not the trendiest one — it is the one matched to your actual skin type.
<!-- AFFILIATE: Links to slugging products and alternatives -->Related Guides:
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