Although allergic reactions to REN Clean Skincare products are very rare, if you think you have suffered from an allergic reaction, please stop using the product. It is possible to be allergic to pretty much anything including essential oils and other natural ingredients. If you suspect you have a sensitivity we would strongly recommend that you test a small amount of any new product on the inside of your elbow. If you experience any redness or tingling you should return the product for a refund, please contact the team here and we'll be able to provide advice.