Get out your magnifying glass. Look at the label on your perfume. The word ‘geraniol’ may be written there, as this is one of the perfume ingredients known to trigger sensitivity, in some people – so it’s there as a warning. (Doesn’t mean it will. Just that it can. Maybe. Sometimes.) It’s actually a natural aroma chemical found in roses, but also citronella, geranium, palmarosa, petitgrain, eucalyptus. Geraniol’s used in perfumery to ‘extend’ the scent of roses, bringing sheer, floral freshness to blends.