Vaseline is a brand of white petrolatum (petroleum jelly) used primarily to lock moisture into skin, protect minor wounds, and prevent chafing and irritation. It works differently than most moisturizers: rather than adding water to your skin, it creates a protective layer that keeps existing moisture from escaping. That single property makes it useful for a surprisingly wide range of purposes, from healing cuts to unsticking a rusted zipper.
How Petroleum Jelly Works on Skin
Most people assume Vaseline sits on top of your skin like plastic wrap. It actually does something more interesting. Petroleum jelly permeates throughout the outermost layer of skin (the stratum corneum), filling in the spaces between skin cells where it replaces the natural lipid layers. This dramatically slows water loss from the skin’s surface while still allowing normal barrier repair to happen underneath.
This occlusive effect is what makes petroleum jelly so versatile. By trapping moisture, it keeps skin hydrated, softens rough or flaking patches, and creates a physical shield against irritants. It has a comedogenicity rating of 0, meaning pharmaceutical-grade white petrolatum does not clog pores, despite its thick, greasy texture.
Wound Healing and Scar Prevention
One of the most evidence-backed uses for Vaseline is keeping minor cuts, scrapes, and scratches moist while they heal. The American Academy of Dermatology recommends petroleum jelly for this purpose: a moist wound heals faster than a dry one because it avoids forming a hard scab, which slows down tissue repair and can lead to larger, deeper, or itchier scars. As long as you clean the wound daily, antibacterial ointments aren’t necessary.
Research on post-surgical wounds supports this. In a study comparing wound care approaches after dermatologic procedures, patients who used white petroleum jelly had redness at only 12% of wound sites, compared to 52% in a group using a different petrolatum-based healing ointment. Crusting and scabbing appeared in just 12% of the petroleum jelly group versus 47% of patients who used no ointment at all. That’s a meaningful difference for something as simple and inexpensive as Vaseline.
Dry Skin and Eczema Relief
Petroleum jelly is a go-to recommendation for severely dry or cracked skin. Applying it after a bath or shower, while skin is still slightly damp, traps that surface moisture and lets the outer skin layer rehydrate like a sponge. This makes skin thicker, more elastic, and less prone to cracking. For people with chronically dry hands, feet, or elbows, a layer of Vaseline under cotton gloves or socks overnight can produce noticeably softer skin by morning.
For eczema (atopic dermatitis), petroleum jelly serves as a simple, fragrance-free barrier that protects damaged skin from irritants and allergens that can trigger flare-ups. It won’t treat the underlying inflammation, but it reduces the cycle of dryness, cracking, and irritation that makes eczema worse.
Managing Psoriasis Symptoms
Petroleum jelly can make psoriasis plaques more comfortable. It softens thick, scaly patches so they feel less stiff and painful, and well-moisturized scales lift more easily during bathing, leaving smoother skin underneath. The National Psoriasis Foundation notes that it’s not a treatment for the disease itself, so prescribed medications should continue alongside it.
One important caution: don’t apply petroleum jelly before your prescription topical medication. The occlusive barrier can prevent the active ingredients from penetrating into the skin where they need to work. Apply medication first, then use Vaseline over it only if your dermatologist advises it.
Diaper Rash Prevention
Pediatricians commonly recommend petroleum jelly as a barrier cream for newborns and infants. Applied in a thick layer at each diaper change, it sits on top of the skin and prevents urine and stool from directly contacting and irritating it. UT Southwestern Medical Center advises applying it generously and not rubbing it in like lotion. The goal is a visible protective layer, not absorption. It won’t heal existing rashes, but it’s effective at preventing new irritation from developing.
Slugging: The Overnight Skin Repair Technique
Slugging is the practice of applying a thin layer of petroleum jelly over your regular moisturizer before bed. The name comes from the shiny, slug-like appearance it gives your face. Dermatologists at the Cleveland Clinic confirm it works: the sealed-in hydration helps repair a damaged skin barrier overnight, and the occlusive layer prevents outside irritants from reaching the skin while you sleep.
It’s best suited for dry, dehydrated skin, particularly during winter when humidity drops. You might need a couple of consecutive nights to see results, but it rarely needs to become an every-night habit. If you have oily or acne-prone skin, skip it. Skin that already produces plenty of oil doesn’t benefit from an additional lipid layer on the surface, and trapping excess oil can lead to breakouts.
Chafing, Blisters, and Lip Care
Runners, hikers, and anyone prone to skin-on-skin friction use petroleum jelly to prevent chafing on thighs, underarms, and feet. A thin layer reduces friction enough to prevent the raw, burning patches that develop during extended activity. Applied to feet before pulling on socks, it can also reduce blister formation on long walks or runs.
Vaseline is also one of the simplest lip balms available. Lips lack oil glands and lose moisture faster than the rest of your face, so a petroleum jelly layer helps them stay hydrated in cold or dry weather without the added fragrances or flavoring agents that can irritate sensitive lips.
One Place to Avoid: Inside Your Nose
Applying Vaseline inside dry nostrils is a common home remedy, but the Mayo Clinic warns against it, especially as a regular habit. Petroleum jelly applied inside the nose normally drains down the back of the throat and gets swallowed. Occasionally, though, small amounts can travel into the windpipe and lungs instead. Over months of repeated use, this buildup can cause lipoid pneumonia, an inflammatory lung condition that may produce coughing, chest pain, or shortness of breath. If you need a nasal lubricant, water-soluble options are safer, and you should avoid applying any product inside your nose within several hours of lying down.
Practical Household Uses
Petroleum jelly’s lubricating and moisture-resistant properties make it useful well beyond skin care:
- Squeaky hinges: Warm a small amount and work it into the hinge, moving the door back and forth to distribute it.
- Stuck or stiff zippers: Apply a thin line to the zipper teeth with a cotton swab and wiggle the slider back and forth to spread it evenly.
- Light bulb removal: A dab on the threads before installation prevents rust and corrosion, making bulbs easy to unscrew months later.
- Candle wax cleanup: Rub petroleum jelly around the rim of a candle holder before lighting, and wax wipes away cleanly afterward. For existing spills, apply the jelly, wait 15 minutes, and peel the wax off.
- Rust removal: A thick layer left on rusted metal overnight loosens surface rust, which wipes away the next day.
- Sliding tracks: A small dab on window or shower door tracks keeps them gliding smoothly and quietly.
- Paint protection: Coat doorknobs, hinges, or window latches with a thin layer before painting a room. Any paint that lands on the coated surface wipes right off.
For all of these uses, a small amount goes a long way. Petroleum jelly doesn’t evaporate or dry out, so it stays in place far longer than spray lubricants or water-based alternatives.