Aromatherapy uses essential oils — highly concentrated extracts from the roots, leaves, seeds, or blossoms of plants — to promote healing. It’s a practice that can be traced back to at least 5,000 years ago.Trusted Source

The oils can be inhaled using a diffuser, or diluted in a carrier oil and massaged into the skin. Some are used to treat inflammation or infections while others are used to promote relaxation and calm.