Some essential oils, such as Cinnamon bark, Ylang-Ylang and Lemongrass, are more prone to causing allergic reactions than others. In most cases a single constituent (such as cinnamaldehyde in Cinnamon bark and citral in Lemongrass) is responsible.
This can happen anytime after the first exposure to an essential oil, and usually presents as an itchy rash or hives. This is caused by the immune system's .
Pain, swelling, or tenderness of the skin; Itchiness; Hives, rash, or boils; Digestive upset. First, because essential oil sensitivities are not true allergic reactions, other. Unlike with true allergic responses, which cause symptoms no matter the