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So how can you tell the difference and what should you do? The first thing to do when ever you purchase a new skin or personal care product is to test it to see if you have any adverse reactions to this product. Below is a detailed outline and links that will provide you with all the information you need to test a new product in order to determine whether or not your skin is going to react adversely to it or not. Test the Products to Avoid Allergic Reactions Another important aspect to using any skin care, personal care or cosmetic products, whether they are natural or otherwise, is to test the products first in order to see.