The skin on the feet is said to readily absorb substances which it comes into contact. Many people who use essential oil mixes to ward off colds, flu and other germs swear by the “rub on the feet before going to bed” routine. You can also apply essential oils, mixed with a carrier oil, to the neck, chest, belly, inner arms, hands, and face. Some oils such as cinnamon and lemon, may cause a burning sensation or leave an actual burn, if they make contact with a sensitive area. Avoid using these oils on places like the face, underarms, and other sensitive spots.