This infographic was just published by Women's Voices for the Earth. It focuses on allergies linked to the use of artificial fragrances in personal care products. Artificial fragrances have been linked to numerous health issues. This is a big reason why I'm making more and more of my own household products and scenting them with essential oils.
To see a ranking of personal care products and their potentially health hazards, check out the Skin Deep Cosmetics Database from the Environmental Working Group.