Fragrance is present in the majority of skincare products sold globally, including many marketed as “gentle” or “suitable for sensitive skin.” It’s also the most frequent cause of cosmetic contact reactions, appearing in more adverse event reports from dermatology practices than any other ingredient category. The disconnect between how common fragrance is and how problematic it can be is worth understanding for anyone who has ever reacted to a product and couldn’t figure out why.
What fragrance actually is
Fragrance isn’t a single ingredient. In cosmetics, “fragrance” or “parfum” on an ingredient list is a collective term that can represent a mixture of dozens or hundreds of individual chemical compounds. EU regulations require that when any of 26 identified fragrance allergens appear above threshold concentrations (0.001% in leave-on products, 0.01% in rinse-off), they must be listed individually on the label. Below those concentrations, they can be hidden within “fragrance.”
The 26 allergens currently required to be listed in the EU include well-known sensitisers like isoeugenol, cinnamal, limonene, linalool, and citronellol. The EU’s Scientific Committee on Consumer Safety is actively reviewing this list to expand it, as current research suggests the 26-allergen list significantly underrepresents the actual number of fragrance sensitisers.
In markets with less stringent labelling, “fragrance” can cover an even broader and less transparent mixture of ingredients.
Why fragrance causes reactions
Fragrance causes two types of reactions: irritant contact dermatitis and allergic contact dermatitis. These are different mechanisms with different implications.
Irritant contact dermatitis is a direct chemical response. Certain fragrance components irritate skin at threshold concentrations without involving the immune system. This produces redness, stinging, or rash in the area of application. Almost anyone can experience this with enough fragrance concentration.
Allergic contact dermatitis is an immune-mediated response. After initial exposure (or sometimes multiple exposures), the immune system becomes sensitised to a specific fragrance compound. On subsequent exposures, even to very small amounts, the immune system mounts a response that can produce significant redness, itching, blistering, or rash. Once sensitised, a person is sensitised for life. The threshold for reaction tends to lower over time, meaning increasingly small amounts of the allergen trigger increasingly significant responses.
Fragrance sensitisation is cumulative and often happens gradually, which is why people can use a product for months or years before suddenly reacting to it. The sensitisation develops over time and then reaches a threshold where symptoms become apparent.
Essential oils are not an exemption
Natural fragrance from essential oils contains the same sensitising compounds as synthetic fragrance, and sometimes more of them. Limonene in lemon and orange essential oils. Linalool in lavender and many others. Cinnamal in cinnamon. Geraniol in rose and geranium. Eugenol in clove and cinnamon.
Many natural and “clean” beauty brands substitute synthetic fragrance with essential oil blends while marketing the product as fragrance-free or natural. This is misleading. From a skin sensitivity standpoint, essential oil-derived fragrance allergens are chemically identical to synthetic versions and cause the same reactions.
“Scented with essential oils” or “naturally fragranced” doesn’t mean lower reaction risk for sensitive or reactive skin. For people who have experienced fragrance reactions, the advice to avoid fragrance applies to essential oil fragrance equally.
How to identify fragrance on labels
Look for “fragrance,” “parfum,” or “aroma” on ingredient lists. These indicate a synthetic fragrance blend. Look for individually named essential oils (lavender oil, citrus aurantifolia peel oil, etc.) which indicate natural fragrance. Both are fragrance.
Products that are genuinely fragrance-free have neither. They may contain naturally-scented ingredients (like vanilla extract or shea butter) that have an incidental scent, but they don’t add fragrance for its own sake.
“Unscented” is not the same as “fragrance-free.” Unscented products can contain fragrance added to mask the smell of other ingredients, creating a neutral smell without actually being free of fragrance compounds.
Who should prioritise fragrance-free
Sensitive and reactive skin types: fragrance is the most likely hidden trigger for unexplained reactions. Removing fragranced products from a routine is the highest-yield single change for skin that reacts to products without an obvious cause.
Anyone with rosacea: fragrance is a documented trigger for rosacea flares, and the face is the primary affected area.
Eczema and atopic skin: the compromised barrier in eczema allows deeper penetration of fragrance compounds, increasing both irritation and sensitisation risk. Fragrance-free is a consistent recommendation in eczema management guidelines.
Infants and children: as discussed in the baby skincare post, developing immune systems and thinner barriers make fragrance-free the appropriate default for all infant products, not just eczema-specific ones.
Anyone using products around the eye area: the periorbital skin is thinner and more sensitive than other facial skin, making it more vulnerable to fragrance-related reactions.
Finding effective fragrance-free products
Fragrance-free doesn’t mean the product has to smell medicinal or unpleasant. Well-formulated skincare without added fragrance can smell neutral or have a mild natural scent from the base ingredients. The HOIA product range includes fragrance-free options where ingredient integrity is prioritised over scent, reflecting the brand’s approach to natural formulation without the unnecessary sensitisation risk that fragrance adds.
Reading labels consistently is the only reliable way to avoid fragrance. Front-label claims like “gentle,” “soothing,” and “for sensitive skin” do not guarantee fragrance-free formulation. Checking the INCI list for fragrance, parfum, and named essential oils is the actual verification step.