Vaseline is one of the most effective and affordable moisturizers for eczema. Petroleum jelly works by forming an oily barrier on the skin’s surface that locks in moisture and prevents water from evaporating, which is the core problem in eczema-prone skin. Dermatologists routinely recommend it as a first-line moisturizer, and research shows it does more than just sit on the surface.
How Petroleum Jelly Repairs Eczema Skin
Eczema skin has a damaged outer barrier. The outermost layer of skin, which normally keeps water in and irritants out, is thinner and leakier than it should be. This leads to dryness, cracking, and the constant itch-scratch cycle that makes flare-ups worse.
Petroleum jelly addresses this in a surprisingly active way. While it was long considered “inert,” a 2015 study in the Journal of Allergy and Clinical Immunology found that it actually triggers the skin to produce more of the proteins responsible for barrier strength, specifically filaggrin and loricrin. These are the building blocks of a healthy skin barrier, and people with eczema often don’t produce enough of them on their own. In the same study, petroleum jelly increased the thickness of the outer skin layer and significantly reduced immune cell activity in eczema-prone skin that appeared normal on the surface but harbored hidden inflammation.
This matters because eczema isn’t just a problem during flare-ups. Even skin that looks clear can have underlying barrier defects and low-grade immune activation. Regular use of petroleum jelly helps address both issues at once.
What Makes It Better Than Other Moisturizers
The National Eczema Association ranks moisturizers by their oil content: ointments on top, then creams, then lotions. Petroleum jelly sits at the very top of this hierarchy. It has the highest oil content of any over-the-counter moisturizer, which makes it the most effective at sealing in hydration. It also rarely burns or stings when applied to sensitive or broken skin, unlike many creams and lotions that contain water, fragrances, or preservatives.
Ceramide-based barrier creams are a popular alternative. These contain lipids that mimic the natural fats in healthy skin and form their own protective layer. They work well and feel lighter on the skin. But they cost significantly more than a jar of petroleum jelly, and for pure moisture-sealing ability, petroleum jelly is hard to beat. If the greasy texture of Vaseline bothers you, a ceramide cream is a solid second choice. You can also layer both: apply a thinner cream first, then seal it in with a thin coat of petroleum jelly on top.
Preventing Eczema in Babies
Some of the most striking research on petroleum jelly involves newborns. Studies from the U.S., U.K., and Japan found that applying moisturizer to a baby’s entire body for the first six to eight months of life, starting within the first few weeks, reduced the risk of developing eczema by roughly 50% in high-risk infants (those with a parent or sibling who has eczema, asthma, or allergies).
Petroleum jelly is the preferred option in many of these prevention protocols because it’s inexpensive, widely available, fragrance-free, and well tolerated by newborn skin. Northwestern University researchers specifically highlighted Vaseline as a cost-effective choice for this purpose, noting its potential to prevent what they called “a very devastating disease” at minimal cost to families.
The Best Way to Apply It
Petroleum jelly works best on damp skin. Water needs to be in the skin first for the occlusive layer to trap it. The most effective technique, sometimes called “soak and smear,” follows a simple sequence:
- Soak in a plain water bath (not a shower) for about 20 minutes.
- Smear petroleum jelly directly onto the skin immediately after, without toweling off first. The goal is to trap that water under the ointment layer.
For hand eczema specifically, you can soak just your hands in a pan of water for 20 minutes, then apply petroleum jelly generously and wear cotton gloves overnight. Most people do this nightly routine for one to two weeks during a flare, then continue applying a moisturizer at bedtime even after the skin improves to prevent the next flare.
If you’re using a prescription steroid ointment, the soak-and-smear method also helps the medication penetrate deeper into the skin. The water softens the outer barrier, and the ointment pushes the active ingredient inward while sealing moisture in place.
Limitations and Drawbacks
The biggest downside is texture. Petroleum jelly is thick, greasy, and can feel uncomfortable during the day, especially on areas like the inner elbows or behind the knees where skin folds trap heat. Many people reserve it for nighttime use and switch to a lighter cream during the day.
If you’re acne-prone, the American Academy of Dermatology recommends avoiding petroleum jelly on your face, as it can clog pores and trigger breakouts in some people. On the body, this is rarely a concern.
Petroleum jelly is also purely a moisture barrier. It doesn’t contain active anti-inflammatory ingredients, so it won’t calm a severe flare on its own. It works best as a daily maintenance strategy to keep the skin barrier intact between flares, often alongside prescription treatments when needed. Think of it as the foundation of eczema skin care rather than a standalone treatment for active inflammation.
Choosing the Right Product
Plain, unscented petroleum jelly is what you want. Vaseline’s original formula fits the bill, but any 100% white petrolatum product works identically. Avoid versions with added fragrances, lotions, or “skin therapy” blends, as the additional ingredients can irritate eczema-prone skin. The simpler the ingredient list, the lower the risk of a reaction. One ingredient (petrolatum) is ideal.