“Hot oils” are oils that, when applied to the skin, can cause a hot or burning sensation. YL recommends using a patch test procedure prior to first use. To perform a patch test, apply 1-2 drops of EO to a patch of skin such as the forearm. Observe that area of skin over the course of 1-2 hours for any noticeable reaction; usually reactions occur within 5-10 minutes. If you experience a hot or burning sensation or if you develop a rash, add V-6 carrier oil to the affected area as often as needed. Examples of “hot” oils include cinnamon, clove, lemongrass, peppermint, oregano, thyme, Exodus II, and Thieves.