Skincare · 16/06/2026
The ingredient nobody suspects when skin reacts to "everything" they try
Fragrance is one of the most common, most overlooked triggers of cosmetic sensitivity — and because it's present in such a high percentage of products, fragrance sensitivity often gets misdiagnosed as a reaction to whichever active ingredient happened to be the new variable.
Why fragrance sensitivity gets misattributed to other ingredients so often
When skin reacts after trying a new product, the instinct is to suspect whatever new active ingredient was introduced — a new acid, a new vitamin C concentration — when the actual trigger may simply be fragrance, present in the vast majority of skincare products at concentrations too low to list individually but high enough to trigger sensitivity in fragrance-reactive skin. This misattribution can lead to years of unnecessarily avoiding otherwise well-tolerated active ingredients.
How to actually test whether fragrance is the real culprit
Switching to a genuinely fragrance-free version of a product category that previously caused reactions — particularly toners and other leave-on products with high skin contact time — and observing whether the same reaction occurs is one of the more reliable ways to isolate fragrance as a variable, since it removes that single factor while keeping other ingredients comparable.
Building a fragrance-free foundation before reintroducing other actives
Start with a genuinely unscented toner and base routine, giving skin several weeks to establish a calm baseline without fragrance exposure. Reintroduce other active ingredients one at a time after this baseline is established, watching specifically for reactions now that fragrance has been ruled out as a confounding variable — this systematic approach reveals true active-ingredient sensitivities much more reliably than guessing.
Dear, Klairs Supple Preparation Unscented Toner 180ml — available on BuyBeautyKorea →
