Essential Oils
Concentrated plant oils — and why "natural" doesn't mean "gentle" for eczema-prone skin
INCIVarious
- Category
- Botanical
- Risk level
- medium
- NEA recommendation
- The National Eczema Association lists essential oils among eczema triggers and recommends avoiding them on eczema-prone skin
- Not a single chemical
- Each oil contains hundreds of compounds; many (limonene, linalool, citral, geraniol, eugenol) are individually recognised contact allergens
- The "natural" fallacy
- Plant origin doesn't prevent sensitisation — the allergenic molecules are chemically identical to their synthetic counterparts
- Citrus + sun
- Bergamot, lime, lemon and grapefruit oils carry furocoumarins that cause phototoxic burns on sun-exposed skin
Look for these names on ingredient lists
This ingredient may appear under any of these names:
Commonly found in
Possible reactions
- Allergic contact dermatitis from topical application
- Phototoxic reactions from citrus oils plus UV
- Airborne contact dermatitis from diffused oils
- Eczema flares from even brief contact
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Always scan the actual label before use — formulations change.
What are essential oils?
Essential oils are highly concentrated aromatic plant extracts obtained by steam distillation, cold pressing, or solvent extraction of flowers, leaves, bark, seeds, roots or peel. "Essential" refers to capturing the essence (scent) of a plant — not to being nutritionally essential.
Each oil is a complex mixture of hundreds of volatile compounds. A few common examples and their key constituents:
- Tea Tree (Melaleuca alternifolia) — terpinen-4-ol, α-terpinene, 1,8-cineole
- Lavender (Lavandula angustifolia) — linalool, linalyl acetate
- Peppermint (Mentha piperita) — menthol, menthone
- Lemongrass (Cymbopogon) — citral (geranial + neral), geraniol
- Eucalyptus (Eucalyptus globulus) — 1,8-cineole (eucalyptol)
- Ylang Ylang (Cananga odorata) — linalool, geraniol, isoeugenol
Many of these compounds are EU-regulated fragrance allergens that must be declared on labels above threshold — and they're the same molecules responsible for the scent and the contact allergy.
Why they cause reactions
Two main mechanisms:
- Sensitisation. Reactive fragrance chemicals (linalool, limonene, citral, geraniol, eugenol, isoeugenol) form hapten-protein conjugates; once sensitised, any re-exposure triggers Type IV delayed hypersensitivity. Oxidation (old, air-exposed oils) increases the risk.
- Phototoxicity. Citrus oils (bergamot, lime, lemon, grapefruit) contain furocoumarins that cause direct chemical burns and pigmentation on sun-exposed skin where the oil was applied — not immune-mediated, but very real.
The NEA's avoidance advice for eczema rests on three points: a compromised barrier lets more in; the fragrance chemicals directly trigger flares and sensitisation; and these oils are often (mis)marketed for sensitive skin.
"Natural" was the marketing word that personally sent me down a rabbit hole — I assumed plant-derived meant skin-friendly. It doesn't. The molecule your immune system reacts to is identical whether it came from a lavender field or a lab. I'm not anti-plant; I just want the word "natural" to stop doing safety work it was never qualified to do. — Snehal
Where they're found
- "Natural"/organic skincare — face oils, serums, moisturisers.
- Aromatherapy — diffuser oils, massage oils, bath products.
- Hair oils — many scented blends.
- DIY cosmetics, candles and room sprays (inhalation route).
How to spot them on labels
On INCI labels, look for botanical Latin names + "Oil"/"Leaf Oil"/"Flower Oil"/"Peel Oil"/"Extract" — e.g. Melaleuca Alternifolia Leaf Oil, Lavandula Angustifolia Oil, Mentha Piperita Oil. Individual allergens may also be listed: Linalool, Geraniol, Citral, Eugenol, Limonene.
Safer alternatives
- Fragrance-free skincare — Cetaphil, CeraVe, Vanicream, La Roche-Posay Toleriane, Eucerin.
- Plain carrier oils — pure coconut, sesame or sunflower oil without added essential oils.
- Fragrance-free hair oils — unscented coconut, castor or argan.
- Non-fragrance botanicals — green-tea or oat extract for benefits without the volatile allergens.
The bottom line
Essential oils are concentrated mixtures of fragrance chemicals, and "natural" gives no protection from allergy — many are recognised sensitisers, and citrus oils add phototoxicity. For eczema-prone, perioral-dermatitis-prone or fragrance-allergic skin, the NEA's blanket-avoidance advice is sound: there's scent to gain but no skin benefit, and real risk to lose.
Browse products in the AllerNote catalog
If you want moisturisers and serums without essential oils, start from the skincare product catalog: open a brand, use the category filter when available, then read the full INCI list and formula flags on each product page — more reliable than front-of-pack "natural" claims.
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