Patch tests are an easy way to help predict if you may experience a negative initial reaction to a new product. It is recommended to perform a patch test before incorporating any new product into your regimen. We have outlined a general method for conducting your own patch test below based on the type of product. 1) Apply a small amount of the product onto a clean area of skin on the upper forearm. 2) Keep the area dry. 3) If the product has a specified duration of use, rinse off after this time has elapsed. Otherwise rinse off after 24 hours. 4) If any redness, burning, itching, blistering or irritation is observed at any time throughout the test, do not use the product.