You can use oils as part of a ritual. In traditional magick, oils are placed in the West of the altar for the Water element, or the East, if lit, to symbolize the fragrance rising on the Air. But they can equally form the focus of any spell, each oil being charged with its particular purpose before use.
Oils are very potent and should only be used in accordance with instructions inside the box from the manufacturer. Certain oils, particularly citrus oils, can irritate the skin if they are exposed to the light, and about half of the normal amount of other oils should be used in baths and massage. Avoid direct sunlight for six hours after use. Some can be an irritant to the skin and so should be used sparingly and well-diluted.
Oils should never be taken internally and, except for pure rose and lavender, should not be applied undiluted to the skin.