Overuse of some cosmetics can cause allergies and other skin problems. Ingredients such as fragrance and preservatives can cause allergic reactions in some people. Skin reactions, which doctors call contact dermatitis, should be taken seriously. Even if you've used a cosmetic for years with no problems, you can develop an allergic reaction as you become sensitized to one or more of the ingredients. Before placing this claim on the label, some companies conduct tests, and others simply don't include perfumes or other common problem-causing ingredients in their products.
Natural ingredients can cause allergic reactions.
If you have an allergy to certain plants or animals, you could have an allergic reaction to cosmetics containing those ingredients.