Why your balm feels greasy when your cream does not

Why your balm feels greasy when your cream does not

Two complaints, and they arrive from the same jar.

The first is in the warm kitchen: you rub in the balm and ten minutes later your hands still look polished, while the cream you made from the same oils, at a similar total load, sank in and said nothing about it. The second arrives in February: the balm that behaved beautifully in July has spent the night in the pocket of a coat in an unheated hall, and now it will not give under a thumb at all. You are scraping at it like cold butter.

Neither of those is bad luck, and neither is really about which oils you chose. They are both consequences of one structural fact: in a balm, a stick, a body butter or a water-in-oil cream, the oil phase is the continuous phase. Nothing has to evaporate before the oils become the surface. They are the surface, from the first second.

That is a different physical problem from the one described in why does my cream feel greasy, where the oil is the inner phase and arrives late. This piece is about what changes when the oil arrives first, and it sits inside our series on plant oils by fatty-acid group. The neat-oil ranking numbers — spreading values, polarity scales — are dealt with separately in why one oil feels light and another feels heavy and are not repeated here.

"Which oil is best for a balm" has no answer, and that is the useful part

A cuticle balm, a lip balm, a body stick and a barrier-type ointment are asked for different residues, different melt behaviour and different lengths of stay. There is no oil that is best across that range, because there is no single target.

What transfers between them is a sequence, not a list: decide what residue you want at ten minutes and what melt you want on contact, choose oils and structurants that produce them, and verify at the bench — because none of it follows from an ingredient list.

In our formulators' experience the commonest error is choosing oils by their neat-oil reputation and then being surprised by a stick that drags, when the wax level and the butter fraction were doing most of the talking.

At the bench: write the target down in two numbers before you weigh anything — what you want to feel at thirty seconds, and what you want to see at ten minutes. A balm brief without those is a wish, and you will not be able to tell whether the next batch is better.

Occlusion: what has actually been measured on skin

In an anhydrous product the first property that stops being secondary is occlusion — how much an unbroken lipid film slows water leaving the skin. It has been measured in living people by several independent laboratories, and the results are more modest and more interesting than the folklore.

Stamatas and colleagues in the Journal of Dermatological Science (2008) used in vivo confocal Raman microspectroscopy — a way of reading the water concentration at successive depths in the skin without taking a sample — on the forearms of nine adults and seven infants, before application and at 30 and 90 minutes after it, testing paraffin oil and two vegetable oils with petrolatum as the positive control. Judging occlusion from swelling of the stratum corneum — the outermost layer of the skin, the flattened dead cells that do the barrier work — they found 10–20 per cent swelling for the three oils against 40–60 per cent for petrolatum, and concluded there was no statistical difference between the paraffin oil and the vegetable oils in penetration or occlusion.

Patzelt and colleagues in Skin Research and Technology (2012) asked the same question with transepidermal water loss (TEWL — the instrument-measured rate at which water escapes through the skin), testing four vegetable oils and paraffin oil on six healthy volunteers, petrolatum again as control. The vegetable oils, with the exception of jojoba, and the paraffin oil produced similar occlusion of the skin surface, with the most effective occlusion found for petrolatum. The authors call the effect of the oils a semi-occlusion. Jojoba — a wax ester rather than a triglyceride — was the exception; the study did not determine why.

Pinto and colleagues in the Journal of Cosmetic Dermatology (2022) ran the largest panel, 80 healthy adult female volunteers, measuring TEWL before application and at 15 minutes, 2 hours and 6 hours. Their result adds the axis the smaller panels could not: the vegetable oils did not give the high immediate occlusion petrolatum did at 15 minutes, but most of them showed occlusive performance comparable to petrolatum across the whole 6-hour course. Occlusion, in other words, is a time course and not a score.

Rubio-Santoyo and colleagues in the Journal of Clinical Medicine (2025) ran a within-person randomised comparison of extra virgin olive oil against petrolatum on the volar forearm in 54 healthy participants. Both raised stratum corneum hydration and reduced erythema and skin temperature; only petrolatum reduced TEWL. These are instrumental measurements on healthy skin, not statements about treating anything.

And the one study that speaks to composition rather than category: Choe, Schleusener, Lademann and Darvin (2017) compared mineral-derived paraffin and petrolatum against plant-derived almond and jojoba oils by confocal Raman, looking at how the skin's own intercellular lipids were ordered at different depths. All the oils stayed in the upper layers, at 0–20 per cent of stratum corneum thickness, and skin treated with the plant oils showed more disordered lateral and lamellar packing there than untreated skin.

What we went looking for and could not find is a study that varied fatty-acid composition systematically — an oleic-dominant oil against a linoleic-dominant one at equal load on the same skin — and measured occlusion against it. The studies above compared whole oils, or categories of oil. Anyone telling you that a particular fatty-acid profile is more occlusive is going beyond what has been measured.

At the bench: if the brief is "seals better", the lever is the class of material and the total lipid load, not the fatty-acid profile of the liquid oils. And judge it at more than one clock time — at 15 minutes your balm will lose to petrolatum, and by six hours it may not.

Water-in-oil: the water is inside, and it still changes the feel

A water-in-oil (W/O) emulsion — water droplets dispersed through a continuous oil phase, the reverse of the usual arrangement — is not an anhydrous product with water added. It is a system whose continuous phase is not the one that evaporates, and that changes its whole trajectory on skin.

Salehi, Mortazavi and Moghimi (2022) applied 5 mg/cm² of five creams and followed cream type, droplet size, occlusivity and water loss at zero, one, two and four hours, on an aluminium-sheet model held at 32 °C and on an in vivo mouse-skin model. The oil-in-water creams inverted — three on aluminium, and the one tested on mouse skin also inverted after an hour. The W/O creams did not invert at all. Their bases were pharmaceutical-type — paraffins, beeswax, cetostearyl alcohol — so what transfers is the behaviour, not their figures. And note the limit: the emulsion type stayed unchanged for four hours; that is not a demonstration that the feel stayed unchanged.

That single result explains the first complaint in this article. An O/W cream spends its first hour turning into something else, and the oils only become the surface at the end of that. A W/O cream, and even more so a balm, starts where the cream finishes. Same oils, different arrival time, different verdict.

Sensory panels find the same division. Korać, Krajišnik and Milić in the International Journal of Cosmetic Science (2016) compared a fast-inverting O/W base with reference O/W and W/O bases across twenty attributes assessed by twenty experienced assessors, alongside rheology and conductivity, in the presence of ions from an artificial sweat solution and at different temperatures. Statistically, the reference W/O emulsion was significantly different from the reference O/W and the fast-inverting one. Emulsion type is a sensory decision before it is a stability decision.

One more finding worth having, because it demolishes a common assumption. De Paepe, Sieg, Le Meur and Rogiers in Skin Pharmacology and Physiology (2014) measured TEWL and hydration after a single application on the forearms of 26 healthy young female volunteers, comparing three silicone excipients, three water-in-(oil-plus-silicone) creams containing 10 per cent of the respective silicone, and petrolatum. Petrolatum formed an occlusive layer and raised skin hydration for more than four hours; the W/(O + Si) creams moisturised the skin without any effect on TEWL. So a W/O emulsion is not automatically an occlusive product: the continuous phase decides the geometry, the materials in it decide the barrier to water vapour.

On W/O emulsifiers the published evidence runs out. We could not open a study that varied W/O emulsifier chemistry while holding the oil phase constant and measured sensory outcome on skin. In our formulators' experience the W/O emulsifier sets the drag on rub-out and how long the product stays wet before it breaks, far more than the choice between two liquid oils does — and adjusting the internal water fraction changes perceived richness more cheaply than swapping oils. Treat that as a hypothesis for your own paired trial.

At the bench: if a W/O cream reads as heavy, try the internal water fraction and the emulsifier before the oil blend, and hold everything else fixed while you do it.

Melt, wax and what stays behind

Take the water out entirely and the sensory question narrows to three things: how readily the product yields to finger pressure and body heat, what it feels like during rub-out, and what is left afterwards.

The clearest panelled comparison across these formats comes from García and colleagues in Drugs in Context (2023), whose panel of 16 experts assessed vehicles — not finished medicines, since the panellists were healthy volunteers — at four stages: appearance, pick-up, rub-out and afterfeel, each attribute rated on a 0–100 per cent line scale. The ointment showed the least desirable behaviour for stickiness, grease behaviour, wetness and spreadability. Where the cream vehicle's gloss disappeared quickly and left low stickiness and little residue, that afterfeel behaviour was not observed with the ointment. The oleogel — an oil structured into a gel without water — sat between them: sensory properties similar to the cream vehicle, but with lower integrity of shape, lower wetness and higher greasiness.

Read that as the trade you are making. The greasiness you are complaining about is largely structural: it belongs to the format, and picking a kinder oil does not buy your way out of it.

Wax choice is where structure and touch meet, and it has begun to be measured properly. Nonomura, Saito and Nomura in the Journal of Oleo Science (2025) built a biomimetic tactile sensing system — a finger-model probe matched to the elastic modulus and surface energy of human skin, grooved to imitate fingerprints, driven by a sinusoidal-motion friction device — and used it on organogel (an oil held solid by a gelling agent, the same idea as an oleogel) and dispersion formulations. Wax from rice bran and rice paraffin showed high oil-gelling ability, and the resulting gel was smooth to the touch, which they offer as evidence of suitability for lipstick and cleansing products.

The word "and" is doing real work there. Gelling power and smoothness are separate axes: a wax can be strong and draggy, or weak and pleasant. The pairing has to be checked wax by wax.

Butters bring a variable that liquid oils do not: they melt over a range rather than at a point, and that range interacts with skin temperature and with the temperature of the room. In our formulators' experience this is why a balm that behaves beautifully on a warm hand can feel like a crayon on a cool one. The melt-on-contact is set by the solid fats and the wax, and only fine-tuned by the liquid oils.

At the bench: when a balm is judged greasy, look at the total lipid load and the structurant first, before you reformulate the oil blend. In our experience that is where the complaint usually originates, and García's panel is the published version of the same observation.

The British part: your balm has two climates and one of them is indoors

Now the second complaint, the February one — and this is where a recipe written in a warmer country will quietly give you bad advice.

The Met Office puts the long-term average for UK winter at 4.09 °C and for UK summer at 14.59 °C (1991–2020). That is a ten-degree swing in the ambient temperature your product lives in, and it is a mild description of the real range: the coat pocket on a station platform, the car overnight, the bathroom shelf in a house where the heating goes off at eleven.

Indoors is a separate climate again, and not the one recipes assume. The NHS advises heating your home to a temperature comfortable for you and, if you can, "at least 18°C in the rooms that you regularly use, such as your living room and bedroom". That is guidance for the rooms you are in. The hall cupboard, the spare room and the bathroom where the jar actually sits are often colder — which is why "room temperature" in a formulation note is close to meaningless unless you write the number beside it.

So the British anhydrous problem is the opposite of the tropical one. The question is not whether a butter will slump; it is whether a balm will still give at 5 °C without needing a thumbnail, and whether the same stick will feel unpleasantly soft and greasy when the room is 21 °C and the hand is warm. A formula that solves one of those and ignores the other is a summer product or a winter product, not a product.

There is a practical consequence for stability testing too. A butter fraction settled in a July kitchen deserves re-testing in January — not because the chemistry changed, but because the assessor's hands, the room and the jar all did.

At the bench: assess every anhydrous product at two temperatures at least: a cold one around 5 °C, from the fridge or an unheated room, and a warm one at 21 °C. Note the actual number, not "room temperature". If a stick fails at one of them, that is a formulation result, not a bad day.

Choosing oils for a target feel in a continuous oil phase

Catalogue vocabulary was written for neat oils rubbed on the back of a hand. In an anhydrous or W/O system it is closer to applicable than in an O/W cream — the oil really is what touches the skin — but it still needs translating, because the oil now competes with the structurants for the same sensory space.

Four habits do most of the work. Change one variable at a time, remembering that wax and butter levels are variables too, so holding them fixed while you compare oils is the whole design. Assess at fixed clock times — we use thirty seconds, two minutes and ten minutes. Assess at more than one ambient temperature if the product is a stick or a firm balm. And when a balm is judged greasy, look at the lipid load and the structurant before you touch the oils.

What to check at the bench

The discipline is the same one that pays with neat-oil measurements: record the method beside the observation. Note the ambient temperature, the substrate, the clock time and what you held fixed, next to every judgement of greasy or waxy. In a continuous oil phase there is no water leaving to blame — which makes the record shorter, and an unrecorded variable much harder to find later.

Sources

• Stamatas G. N., de Sterke J., Hauser M., von Stetten O., van der Pol A. Lipid uptake and skin occlusion following topical application of oils on adult and infant skin. Journal of Dermatological Science 50(2), 135–142, 2008. PubMed 18164596
• Patzelt A. et al. In vivo investigations on the penetration of various oils and their influence on the skin barrier. Skin Research and Technology 18(3), 364–369, 2012. PubMed 22092829
• Pinto J. R., Monteiro e Silva S. A., Holsback V. S. S., Leonardi G. R. Skin occlusive performance: sustainable alternatives for petrolatum in skincare formulations. Journal of Cosmetic Dermatology 21(10), 4775–4780, 2022. PubMed 35038372
• Rubio-Santoyo A. et al. Effects of extra virgin olive oil and petrolatum on skin barrier function and microtopography. Journal of Clinical Medicine 14(13), 4675, 2025. PubMed 40649050
• Choe C., Schleusener J., Lademann J., Darvin M. E. In vivo confocal Raman microscopic determination of depth profiles of the stratum corneum lipid organization influenced by application of various oils. Journal of Dermatological Science 87(2), 183–191, 2017. PubMed 28522139
• Salehi N., Mortazavi S. M., Moghimi H. Investigating the changes in cream properties following topical application and their influence on the product efficiency. Iranian Journal of Pharmaceutical Research 21(1), e123946, 2022. PubMed 36942074
• Korać R., Krajišnik D., Milić J. Sensory and instrumental characterization of fast inverting oil-in-water emulsions for cosmetic application. International Journal of Cosmetic Science 38(3), 246–256, 2016. PubMed 26444550
• De Paepe K., Sieg A., Le Meur M., Rogiers V. Silicones as nonocclusive topical agents. Skin Pharmacology and Physiology 27(3), 164–171, 2014. PubMed 24457536
• García N. et al. Sensory properties analysis of a calcipotriol and betamethasone dipropionate cream vehicle formulated with an innovative PAD Technology. Drugs in Context 12, 2023-2-8, 2023. PubMed 36968458
• Nonomura Y., Saito Y., Nomura S. Development of biomimetic tactile sensing systems for cosmetics and cosmetic ingredients. Journal of Oleo Science 74(3), 233–240, 2025. PubMed 40024777
• Met Office. Winter — the coldest season and Summer. metoffice.gov.uk — consulted 22 September 2026.
• NHS. Keep warm, keep well. nhs.uk — consulted 22 September 2026.