An emollient is a substance that softens and smooths the skin by filling in tiny cracks between skin cells. Emollients are one of three main components found in moisturizing products, alongside humectants (which pull water into the skin) and occlusives (which seal moisture in). Many products combine all three, but emollients specifically work by restoring the smooth texture of dry or rough skin. They’re a cornerstone of care for conditions like eczema and are widely used in everyday skincare.
How Emollients Work on Your Skin
The outermost layer of your skin is made up of flat, overlapping cells held together by a mixture of natural fats. When those fats are depleted, whether from dry air, frequent hand washing, aging, or a condition like eczema, gaps form between the cells. Your skin feels rough, flaky, and tight.
Emollients work by slipping into those gaps. They contain oily or fatty substances that mimic or supplement the natural lipids your skin produces. Once applied, they physically smooth the surface and help restore a more intact barrier. This is different from a humectant like glycerin or urea, which attracts and holds water, and different from an occlusive like petroleum jelly, which sits on top of the skin to block water from evaporating. A good moisturizer typically uses all three strategies together, but the emollient component is what makes skin actually feel soft rather than just hydrated.
Common Emollient Ingredients
Emollients show up under many names on ingredient labels. Some of the most common include:
- Petrolatum (also acts as an occlusive)
- Mineral oil and paraffin
- Lanolin, derived from sheep’s wool
- Shea butter and plant-derived butters
- Glyceryl stearate, a synthetic emollient used in many creams
- Ceramides, which mirror the natural fats in your skin barrier
- Plant oils like olive, coconut, jojoba, and sunflower oil
Despite big price differences between products, the core ingredients are remarkably similar. Most formulations rely on some combination of petrolatum, paraffin, glycerin, and plant-based oils or butters. One notable distinction: certain plant oils rich in linoleic acid, such as sunflower, safflower, and corn oil, have demonstrated genuine skin barrier benefits. Many other vegetable oils improve the texture and feel of a product without proven therapeutic effects beyond basic softening.
Ointments, Creams, Lotions, and Oils
Emollients come in several forms, and the main difference is the ratio of oil to water. Ointments have the highest oil content, making them the most protective and longest lasting. They work well on very dry, thick, or scaly patches but can feel greasy, which makes some people avoid using them on visible areas like the face or hands.
Creams are lighter, absorb more quickly, and suit most people for everyday use across large areas of skin. Lotions contain even more water, making them the lightest option. They spread easily over hairy areas like the scalp and work for mild dryness but need more frequent reapplication. Bath oils take a different approach entirely: you add them to bathwater, and a thin layer deposits on your skin as you get out.
The general rule is simple. The drier or more damaged your skin, the thicker the product you need.
Emollients and Eczema
Regular emollient use is one of the most effective strategies for managing eczema. A large Cochrane review, which pooled data from multiple clinical trials, found that consistent moisturizer use cut the number of eczema flares by roughly two-thirds. People using moisturizers experienced flares at about one-quarter the rate of those who didn’t. The median time to a flare stretched from 30 days without moisturizer to 180 days with it.
The benefits extended to medication use as well. People who moisturized regularly needed significantly less prescription steroid cream to keep their eczema under control, using about 9 grams less over a six- to eight-week period. That matters because long-term steroid use can thin the skin, so anything that reduces the amount needed is a meaningful win. Across 12 studies involving over 1,200 participants, moisturizer users had substantially lower disease severity scores. The overall conclusion: emollients prevent flares, extend the time between flares, and make prescription treatments more effective when flares do occur.
How to Apply Emollients Effectively
Timing and technique make a noticeable difference. The best moment to apply an emollient is right after a bath or shower, while your skin is still slightly damp. The moisture on your skin gets trapped and absorbed more effectively when you layer an emollient over it. This is sometimes called the “soak and smear” approach.
For general dry skin, applying twice a day (morning and evening) is a good baseline. If you have eczema or very dry skin, you may need to reapply throughout the day whenever your skin feels tight or itchy. Apply gently in the direction of hair growth rather than rubbing vigorously, which can irritate already compromised skin. Use enough to leave a thin, visible sheen rather than a barely-there layer. For whole-body application in adults with eczema, that can mean going through 250 to 500 grams per week.
Possible Side Effects
Emollients are generally well tolerated, but reactions do happen. Some people develop sensitivity to preservatives, fragrances, or specific emulsifiers in a product. This can show up as redness, stinging, or worsening irritation, particularly on already damaged skin. If a new product causes burning or a rash, switch to a simpler formulation with fewer ingredients.
Heavier emollients can occasionally block hair follicles, leading to small bumps that look like acne. This is more likely on the face or other areas with dense hair follicles, and it’s more common with thick ointments. Switching to a lighter cream or lotion usually resolves it.
Fire Safety With Paraffin-Based Products
One risk that catches many people off guard: paraffin-based emollients, while not flammable on their own, soak into clothing and bedding over time and can make fabrics significantly more flammable. This is a documented cause of serious burns and house fires, particularly among elderly smokers or people receiving home oxygen therapy. If you use paraffin-based products regularly, change clothing and bedding frequently (ideally daily) and avoid open flames, cigarettes, or candles while wearing treated fabrics.