Eucalyptus is commonly used for skin care products and therapeutic use. It is used for colds and flu, aches and pains, headaches and skin irritations.
The oil is frequently used in soaps, toiletries and candles.
On a mystical level it is also burned for health, purification and healing.
Never use pure oils on the skin without diluting, never use internally, keep away from children and eyes, always check if there are any medical issues which could cause a problem. Seek help if you have any doubts.