It yields oil that is mild and gentle with a sweet aromatic odour. Bergamot is one of the main constituents of au-de-cologne and its leaves are used in Earl Grey tea. Bergamot pure essential oil is reputed to be particularly effective for treating boils, eczema. psoriasis, acne,cold sores, insect bites, spots and wounds. It is bebeficial for oily complexions and it is a natural insect repellent.