Ask for enough samples that will allow us to try a new product on a small area of our skin every night for five nights. That should be enough time to help us determine if we are allergic to or irritated by the ingredients in the product.
Choose an inconspicuous patch, such as the inside of our wrist, as the test area. If we are allergic to the product, we will see redness on the skin any time during the five-day test period after application.
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