Petroleum jelly, the familiar product sold as Vaseline or used as a base in Aquaphor, is not harmful when applied to skin in its refined form. It has been used safely in skincare and wound care for over a century, and dermatologists still recommend it for conditions like eczema and dry skin. That said, there are a few specific situations where petroleum jelly can cause problems, and the product’s origins in the oil industry raise legitimate environmental questions.
What Petroleum Jelly Actually Does to Your Skin
Petroleum jelly works by forming a semi-permeable film over your skin that locks in moisture. It doesn’t add moisture itself. Instead, it prevents the water already in your skin from evaporating, a process called transepidermal water loss. A clinical study published in the Journal of Clinical Medicine found that petrolatum significantly reduced this water loss compared to untreated skin, dropping from 9.56 to 8.18 grams per square meter per hour. That occlusive barrier also reduces flaking and helps maintain the integrity of the outermost layer of skin.
This is why the American Academy of Dermatology mentions petroleum jelly as an inexpensive, fragrance-free option for children with atopic dermatitis (eczema). It’s one of the most effective moisturizing barriers available, and because it contains no fragrances, preservatives, or active ingredients, it rarely causes allergic reactions or irritation.
It Works as Well as Antibiotic Ointments for Wounds
One of petroleum jelly’s strongest evidence-backed uses is in wound care. A clinical comparison of petrolatum-based ointment versus a combination antibiotic ointment (polymyxin/bacitracin) found no differences in healing outcomes. Redness, swelling, crusting, and skin regrowth were equivalent between the two treatments at every time point measured. The antibiotic group actually fared slightly worse: patients reported significantly more burning at the one-week mark, and one case of allergic contact dermatitis occurred. The study concluded that antibiotics may not be necessary for satisfactory wound healing, and petroleum jelly alone performs just as well.
This matters because antibiotic ointments like Neosporin can trigger contact allergies in some people, while plain petroleum jelly almost never does. Many dermatologists now recommend petroleum jelly over antibiotic ointments for minor cuts, scrapes, and post-procedure wound care.
The One Real Health Risk: Lipoid Pneumonia
There is one well-documented way petroleum jelly can harm you, and it involves the nose and lungs. When petroleum jelly is applied inside the nostrils regularly (some people use it as a decongestant or to soothe dry nasal passages), it can liquefy at body temperature and trickle down toward the lungs. Mineral oils like petrolatum can suppress the cough reflex and slow the tiny hair-like structures in your airways that normally sweep debris upward. This allows the oil to reach the deep air sacs of the lungs, where it causes a condition called exogenous lipoid pneumonia.
Lipoid pneumonia from intranasal petroleum jelly use is uncommon but consistently documented in medical literature, with multiple case reports involving long-term nasal application. A few rare cases have even been linked to heavy external application near the face. The condition is often misdiagnosed initially because it mimics other lung diseases, but it can be treated successfully once identified. The takeaway: applying petroleum jelly to your lips, hands, or body is fine, but avoid putting it inside your nostrils on a regular basis.
The Cancer Question: Refining Matters
Crude oil and its unrefined byproducts contain polycyclic aromatic hydrocarbons, compounds that are known carcinogens. This is why the European Union classifies petrolatum with the risk phrase “may cause cancer,” but with an important caveat. The EU’s Note N states that the carcinogen classification does not apply if the full refining history is known and the substance can be shown to be adequately purified. White petrolatum, the highly refined grade used in pharmacy and cosmetics, has undergone processing that removes these contaminants.
In the United States, the FDA classifies white petrolatum as a safe and effective skin protectant. The concern applies primarily to industrial-grade petroleum products or poorly refined versions that might be sold in unregulated markets. If you’re buying a name-brand product from a reputable manufacturer in the US, EU, or other regulated markets, the petrolatum has been refined to pharmaceutical or cosmetic grade standards.
Environmental Concerns Are Real
The health case against petroleum jelly on skin is thin, but the environmental case is more substantial. Petroleum jelly is a byproduct of crude oil extraction and refining. Its production is tied to the broader environmental costs of fossil fuels: greenhouse gas emissions, potential oil spills, and habitat disruption. The product itself is not biodegradable, meaning it persists in soil and water rather than breaking down naturally. Most petroleum jelly is also packaged in plastic containers, adding another layer of environmental impact.
If environmental footprint is your primary concern, plant-based alternatives exist. Shea butter, beeswax-based balms, and certain plant oil blends can provide similar (though generally less powerful) occlusive effects. None match petrolatum’s combination of low cost, hypoallergenic properties, and barrier strength, but they offer a trade-off some people prefer.
Who Should and Shouldn’t Use It
For most people, petroleum jelly is one of the safest, most effective, and cheapest skincare products available. It’s particularly useful if you have eczema, very dry skin, cracked lips, or minor wounds. People with acne-prone facial skin may want to avoid applying it to the face, since its heavy occlusive properties can trap oil and bacteria in pores, though this applies to any thick occlusive product, not just petrolatum specifically.
Avoid using it inside your nostrils, especially on a daily basis. If you need nasal moisture, saline sprays or water-based nasal gels are safer alternatives that won’t pose a risk to your lungs. And if you’re buying petroleum jelly from an unfamiliar brand or unregulated source, look for “white petrolatum” or “USP grade” on the label to ensure it has been properly refined.