Recent study revealed that many people are allergic to air oxidized form of the linalool, a fragrance ingredient. Linalool is added in many shampoos, skin conditioners and soaps but it is naturally found in lavender, mint, and other plants.
Researchers found that 5 percent and 7 percent people out of 3,000 study subjects were allergic to that oxidized linalool. Eczema can lead to rashes, swelling, itching and cracking.