what is slugging? benefits, how to do it, and who should skip it
slugging is the practice of sealing your skin overnight with a thin occlusive layer, usually applied as the last step of an evening routine. the name comes from the shine it leaves behind, which looks a bit like a slug's trail. unglamorous name, genuinely useful technique.
it got popular through korean skincare and then tiktok, mostly using plain petroleum jelly. we make a balm designed for it, so we have a stake in this, but the honest version of the advice includes who shouldn't do it. that's below too.
what slugging actually does
an occlusive doesn't hydrate your skin. that's the part most explanations get wrong. it forms a physical barrier that stops water from evaporating out of your skin overnight, which is called transepidermal water loss. the moisture is already there, or comes from the products underneath. slugging just keeps it from leaving.
that single mechanism produces four effects:
it holds hydration in: skin that would normally lose moisture to dry air overnight stays plump and soft instead. this is why slugging feels dramatic in winter and unnecessary in august.
it supports a compromised barrier: when your skin barrier is damaged, from over-exfoliation, harsh cleansers, cold weather, or retinoid use, it loses water faster and lets irritants in more easily. an occlusive layer buys your skin uninterrupted time to repair itself.
it calms: by covering the surface and reducing water loss, an occlusive layer helps settle redness, tightness, and rough patches. it isn't treating anything, it's removing the stressor so your skin can recover.
it keeps your other products working: sealing your moisturizer in means it stays on your skin doing its job rather than evaporating or transferring to your pillowcase.
how to slug: step by step
- cleanse gently: slugging seals in whatever is on your skin, so start clean. a non-stripping cleanser like b-wash works well here.
- apply your hydrating layers: damp skin, then your usual moisturizer. slugging over bare skin seals in nothing, which misses the point. try our hydrating gel serum, b-gel, or our moisturizing facial cream, b-cream.
- apply a thin occlusive layer last: thin is the operative word. you want a sheen, not a mask. b-balm is our gel-balm version, formulated to do this without the greasy heaviness of straight petroleum jelly.
- sleep on a pillowcase you don't mind: slugging transfers. a satin or dedicated pillowcase saves annoyance.
- rinse in the morning and continue your normal routine.
how often should you slug?
start with two or three nights a week and adjust. dry skin in winter may want it nightly. combination skin might do it only on the dry patches. oily or congestion-prone skin should keep it occasional, or skip it. there's no benefit to slugging more than your skin needs, and the downside of over-doing it is congestion.
who should skip slugging?
this is where most slugging content goes quiet, so plainly:
if you're acne-prone or congestion-prone, sealing your skin for eight hours can trap sebum and worsen breakouts. some people manage by slugging only on dry areas and avoiding the t-zone. others find it consistently causes clogged pores. patch test on a small area for a week before committing.
if you have fungal acne (malassezia folliculitis), an occlusive layer creates exactly the warm, sealed environment that yeast prefers. generally not recommended.
if you have very oily skin, you probably don't need it. oily skin already retains moisture well; the discomfort you're feeling is more likely dehydration, which is a hydration problem, not an occlusion one.
if you're using strong actives at night, be careful. sealing a retinoid or a strong acid under an occlusive increases its penetration and its potential to irritate. either slug on non-active nights, or apply the occlusive only after your active has fully absorbed and your moisturizer is on.
petroleum jelly vs. b-balm
petroleum jelly works. it's cheap, it's one of the most effective occlusives available, and dermatologists have recommended it for decades. its downsides are aesthetic rather than functional: it's heavy, greasy, slow to absorb, and it sits on the skin like a coating.
b-balm is our answer to that. it's a hybrid gel-balm that combines petrolatum's sealing ability with squalane and a velvety, lightweight texture, so it melts into skin rather than sitting on top. same overnight protection, considerably more pleasant to wear to bed.
if the greasiness of petroleum jelly is the reason you stopped slugging, that's the problem it was built to solve.
frequently asked questions:
what is slugging in skincare?
slugging is applying a thin layer of an occlusive product, like petroleum jelly or an occlusive balm, as the final step of your nighttime routine. it seals the skin to prevent overnight water loss, leaving skin softer and better hydrated by morning.
is slugging good for your skin?
for dry, dehydrated, or barrier-compromised skin, yes. it reduces transepidermal water loss and gives the skin barrier a protected environment to recover in. for oily, acne-prone, or fungal-acne-prone skin, it can cause congestion and is often better avoided.
what does slugging do for your face?
it locks in moisture overnight, supports barrier repair, calms redness and tightness, and stops your other products from evaporating or transferring away. it doesn't add hydration on its own, it prevents the hydration already there from escaping.
can you slug every night?
dry skin often can, especially in winter. most other skin types do better with two or three nights a week. if you notice congestion or breakouts, reduce frequency or limit slugging to dry areas only.
do you put slugging balm on before or after moisturizer?
after. the occlusive is always the last step. apply your moisturizer first, then a thin layer of balm on top to seal it in.
is slugging with vaseline safe?
petroleum jelly is well-tolerated and effective for most skin types, and cosmetic-grade petrolatum is highly purified. the main drawbacks are its heavy, greasy texture and its tendency to trap oil on congestion-prone skin.
build a routine with b-balm
every routine starts with the basics. here’s how b-balm fits in to give your skin the care it needs without complication. new to simple routines? here's how to build a 3-step skincare routine.
