Over a year ago I discovered that I'm #allergic to #formaldehyde. It is in pretty much _everything_ and is so hard to avoid: it goes under many names and is often released over time by #preservatives.
However, I only recently learned that is why I am sensitive to fragrances, too. Even if you check the label this #allergen is rarely listed, instead hidden under the "#fragrance" label. Other times formaldehyde isn't even an ingredient but it's created when you spray a product.