We strongly recommend a patch test behind your ears or inside of your elbow, before you start with any new skincare product. Patch testing is a method of checking if a new skincare product/ingredient is working for your unique skin. Most skin problems are caused by regularly using ingredients that sensitize our skin. Natural ingredients, like herbs, extracts, oils or even essential oils can cause sensitivity. Just the way someone can be allergic to nuts, dairy or wheat, people can be allergic to skincare ingredients as well.