We all use beauty products on a regular basis – soap, shampoo, lotion, cologne, and make-up to name a few. Oftentimes, we fail to scan through the list of ingredients at the back of the container before throwing a beauty product into our shopping cart, overlooking the possibility of an ingredient or two, which we might be allergic to. A study found that more than a third of people have had an allergic reaction to a cosmetic ingredient. Skin reactions can come in two kinds of contact dermatitis.