Have you ever used a product on your vulva and ended up having a bad reaction to the product? Maybe you experienced new redness, pain, and itch after using a new emollient the internet was raving about? If so, you are not alone. Many vulvar products can cause an allergic reaction or contact dermatitis. In this post, I discuss the types of vulvar products you may use if you have lichen sclerosus, what a patch test is, the importance of patch tests, and why they are so important.