Essential oils are highly concentrated oils made from plant extracts. They are used in aromatherapy or diluted and applied to the skin.
While essential oils are often used to improve health, they can cause allergic reactions. You may be more likely to have an allergic reaction to an essential oil if you have atopic dermatitis (eczema) or a history of skin reactions to topical products.
Read more here: https://www.verywellhealth.com/allergy-to-essential-oils-83218
