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If you feel you must test a cosmetic before you buy it, apply it with a new, unused applicator, such as a fresh cotton swab. "Testers" at cosmetic counters in stores are even more likely to become contaminated than the same products in your home. If you have an eye infection, talk with your health care provider, stop using all eye-area cosmetics, and throw away those you were using when the infection occurred.
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Do not add water or, even worse, saliva to moisten it, because that will introduce bacteria into the product.
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