Fragrance is the most common cause of allergic contact dermatitis from cosmetics in many dermatology reviews — yet it's in most shampoos, lotions, deodorants and cleansers. Here is the honest guide.
A single 'fragrance' or 'parfum' label can hide dozens or hundreds of chemical compounds. Regulatory bodies and dermatology groups (AAD, EU cosmetics regulation) have identified fragrance as one of the most frequently implicated allergen groups in patch-test populations.
It's also in products you wouldn't expect: 'unscented' does not mean fragrance-free — it means no added fragrance scent, and some unscented products still contain fragrance compounds for other purposes.
Look for the phrase 'fragrance-free' on the label AND check the INCI list for hidden fragrance (parfum, aroma, essential oils — which can also cause reactions). Many dermatology organizations maintain lists of approved 'sensitive skin' products.
For the first week with a new product, patch-test: apply a small amount to the inner forearm twice daily for a week. A delayed reaction (redness, itching, tiny bumps) is a strong signal to stop.
Keep a diary of products and reactions — the reaction memory feature on this page is designed for exactly this. Patterns (all fragranced products, or only specific ones) are the clue your dermatologist needs.
A patch test by a dermatologist is the definitive way to identify your specific allergens, including the individual fragrance components. Until then, minimize exposure and switch to products with short, simple INCI lists.