Melissa oil, also known as lemon balm oil, is derived from the leaves of the Melissa officinalis plant. It has a fresh, lemony scent and is commonly used in aromatherapy for its soothing and calming properties. It is also known to have anti-viral and anti-inflammatory properties. The oil can be used in skincare products, diffusers, and can be added to a carrier oil for massage. The oil is generally considered safe but it is always best to patch test before using it in large areas and consult a doctor if pregnant or breastfeeding.