Despite the sudden burst in popularity, essential oils are not a new thing. The ancient Egyptians were among the first people to use aromatic essential oils, incorporating them into their daily lives. Pure essential oils were incredibly valuable and saved for priests and royals. Ancient books such as the Bible also talk about the use of essential oils. According to the book, Essential Oils for Beginners, the Old and New Testament reference essential oils over two hundred times.
According to a review published in Evidence-Based Complementary and Alternative Medicine, “at least 90 essential oils can be identified as being recommended for dermatological use, with at least 1,500 combinations.” What gives these oils their skin benefits is their ability to fight against pathogens that are responsible for dermatological infections. Oils can also help to improve inflammatory skin conditions, like dermatitis, eczema and lupus, improve the general appearance of your skin and even aid wound healing. (16)
Oils with standardized content of components (marked FCC, for Food Chemicals Codex) are required[by whom?] to contain a specified amount of certain aroma chemicals that normally occur in the oil. There is no law that the chemicals cannot be added in synthetic form to meet the criteria established by the FCC for that oil. For instance, "lemongrass essential oil must contain 75% aldehyde to meet the FCC profile for that oil, but that aldehyde can come from a chemical refinery instead of from lemongrass."  To say that FCC oils are "food grade" makes them seem natural when they are not necessarily so.
Simple smells such as lavender, chamomile, and rosewater may help keep you calm. You can breathe in or rub diluted versions of these oils on your skin. Scientists think they work by sending chemical messages to parts of the brain that affect mood and emotion. Although these scents alone won’t take all your stress away, the aroma may help you relax.