
Some people experience allergic reactions to common cosmetic-product ingredients. These reactions can come in two types: irritant contact dermatitis, which is an itching or burning reaction to a product irritating the skin, and allergic contact dermatitis, which is more of a "true" allergy to specific ingredients that results in swelling, itching, or blisters [source: American Academy of Dermatology]. Both of these types of reactions are most commonly caused by things like fragrances or preservatives in makeup and other skin care products.
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