Does Vaseline Clog Pores? Petrolatum, Slugging and Acne-Prone Skin

Vaseline is unlikely to clog pores on its own. Petrolatum, its only ingredient, shows weak clogging potential in testing, and a 2024 dermatology review calls its link to acne a misconception. The habit of slugging is a different question: a thick seal over oily, acne-prone skin can trap sweat, residue and other products, which is why some people break out.

Below we separate the ingredient from the habit: what petrolatum does, what the evidence on pores says, how to slug if you want to try it, how Vaseline compares with Aquaphor, and a short checklist of who should and shouldn't bother.

What is petrolatum, and why is it in so many products?

Petrolatum (petroleum jelly) is a semi-solid mix of hydrocarbons refined from petroleum, and it is the most effective occlusive moisturizer in common use. A review of moisturizers in the Indian Journal of Dermatology reports that petrolatum at a concentration of at least 5% reduces transepidermal water loss by more than 98%, while lanolin, mineral oil and silicones cut it by only about 20 to 30%. The same review describes occlusives as ingredients that physically block water from evaporating out of the top layer of skin.

That strength is why you find it in lip balms, healing ointments, eczema creams and barrier repair products. The US label for Vaseline's pure jelly lists a single active ingredient, white petrolatum USP at 100%, sold as a skin protectant for minor cuts, scrapes, burns and chapped skin.

Does Vaseline clog pores?

The evidence says petrolatum itself is a weak pore-clogger at most. A 2024 review in the Journal of the American Academy of Dermatology covering petroleum jelly's history, uses and safety examines its comedogenicity data and describes the link to acne as a misconception. Many comedogenicity ratings you see online trace back to the rabbit-ear test, an animal model. In one such study of common cosmetic ingredients and vehicles, nine tested positive and petrolatum was not among them, while several fatty esters and cocoa butter were.

So why do some dermatologists still say to keep it off acne-prone faces? Because how you use a product matters as much as what's in it. The American Academy of Dermatology (AAD) says to avoid putting petroleum jelly on your face if you are acne-prone, as it may cause breakouts in some people. DermNet, the New Zealand dermatology reference, notes more broadly that occlusive emollients can cause or aggravate acne, perioral dermatitis, folliculitis and boils. Neither statement says petrolatum is a classic comedogen. They describe what can happen when you seal skin that already makes plenty of oil, or seal in something that irritates it.

The ingredient vs the habit

• The ingredient: pure petrolatum is a stable hydrocarbon with weak clogging potential in testing. The JAAD review covers its allergenicity and comedogenicity and treats it as a dermatology staple.
• The habit: slugging puts a thick layer over your whole face for eight hours. Anything underneath, from leftover sunscreen to a rich night cream to a strong acid, stays in contact with your skin for longer and under occlusion.

If you break out after slugging, the culprit is often what was trapped under the jelly, or simply too much occlusion on skin that didn't need it.

What is slugging, and how do you slug your face?

Slugging means coating clean skin with a thin layer of petroleum jelly or a petrolatum ointment overnight to seal in moisture. Cleveland Clinic describes it as slathering your face with petroleum jelly overnight and stresses that it should only be done on clean skin. Here is a careful version:

1. Cleanse thoroughly. Remove sunscreen and makeup first. Double cleansing helps if you wore water-resistant SPF.
2. Apply a simple moisturizer or hydrating serum to skin that is still slightly damp. The occlusive layer holds in whatever water is already there.
3. Skip strong actives that night. Cleveland Clinic advises against layering alpha hydroxy acids, beta hydroxy acids and retinoids under the jelly, because they can irritate more once trapped beneath it.
4. Use a pea-sized amount or less. Warm it between your fingertips and press a thin film over the driest areas. The same article notes you need only a tiny bit, mainly on the driest spots.
5. Protect your bedding. Use an old pillowcase you wash often.
6. Wash it off in the morning with a gentle cleanser.

Frequency is flexible. Cleveland Clinic says there is no hard and fast rule for how often to slug; a few nights in a row can help very dry skin recover, but it should rarely become an every-night routine. If your face turns red or irritated, stop and see a dermatologist.

One safety note: DermNet warns that paraffin-containing ointments on clothing or bedding can catch fire from cigarettes or open flames, so keep petrolatum-soaked fabric away from both.

Is slugging good for acne-prone skin?

For most people with oily or acne-prone skin, full-face slugging is more likely to cause problems than solve them. Cleveland Clinic says plainly that for acne-prone skin, slugging could make your acne worse, and that oily skin already has an adequate or even too-robust lipid layer. It also advises skipping slugging entirely if you have an infection or open wound on the face.

There are sensible middle grounds. Acne treatments such as benzoyl peroxide, adapalene or tretinoin often leave patches of flaky, irritated skin around the nose and mouth. A thin dab of petrolatum on just those patches, the lips and the corners of the nose, applied over your moisturizer, gives you barrier support without sealing your whole face. This is sometimes called spot slugging. Keep it off areas where you get clogged pores or bumps, and give it two to three weeks before deciding whether it helps. If you're on a prescription, ask the dermatologist who prescribed it before adding an occlusive over the treated area.

If you're unsure whether your skin is truly oily or just dehydrated, our guide to a routine for acne-prone skin covers the basics, and closed comedones on the forehead explains the tiny bumps that heavy occlusion can make worse.

Who should and shouldn't try slugging?

Slugging works best for dry, flaky or compromised skin and least well for oily skin with frequent clogged pores. Use this checklist before you try it:

For more on rebuilding a stressed barrier without overdoing occlusion, see our guide to a damaged skin barrier.

Aquaphor vs Vaseline: which is better for your face?

Vaseline is pure petrolatum; Aquaphor is a lighter ointment with less petrolatum and a few added ingredients. Aquaphor's US product page lists petrolatum (41%) as the active ingredient, with mineral oil, ceresin, lanolin alcohol, panthenol, glycerin and bisabolol among its other ingredients, and calls the formula preservative and fragrance free. Vaseline's label lists 100% white petrolatum.

Neither is clearly better for the face. If you have very reactive skin, a single-ingredient jelly gives your skin fewer things to react to. If you dislike the drag of pure petrolatum, Aquaphor spreads more thinly. Both are heavy compared with an ordinary moisturizer, so the same who-should-slug rules apply. If you want something lighter than either, our guide to squalane oil covers a face oil that sits closer to a moisturizer in feel.

Can a skin scan or ingredient scanner help you decide?

A before-and-after record shows whether slugging is helping or causing bumps, which is hard to judge from memory. An app like Pori takes a selfie and returns an overall skin score with a breakdown that includes Hydration & Moisture and Pores & Texture, so you can compare a week of slugging nights against a week without. Its ingredient scanner (part of Pro) reads a barcode or a photo of the label and flags each ingredient as beneficial, use with caution or avoid for your skin type, which helps when an ointment or night cream has more on the label than petrolatum.

An app is not a diagnosis. If bumps keep appearing, spread or hurt, or you think you might have perioral dermatitis or folliculitis, see a dermatologist.

The bottom line on petrolatum and pores

Petrolatum is one of the safest, most effective moisturizing ingredients available, and the evidence doesn't support calling it pore-clogging. Slugging is a tool for dry or damaged skin. If your skin is oily or acne-prone, keep the jelly to dry patches and lips, wash it off each morning, and let your own results, logged over a few weeks, make the call.