Fragrances are often often used in skincare, cosmetic and other personal care products.
Fragrances commonly used in personal care products include: citral, citronellol, farnesol, isoeugenol, lavender, menthol...
However, these ingredients are also often allergenic; this means that people exposed to them will often become allergic. And whence they are allergic, people often get rashes / eczema and sometimes serious allergic shocks upon exposure.
This is why they are clearly not recommended to people who have sensitive or reactive skin, or eczema, and of course to those who are already allergic.
Flamingo by Skintifique, the free platform designed to help anyone find personal care products that meet one's safety and ethics criteria is able to identify over 40 commonly used fragrances and their name variations.
To find personal care products that do not contain fragrances, you may use Flamingo by Skintifique.