Tea Tree is an excellent oil for oily skin, colds and also foot care!
Tea Tree Oil (Melaleuca alternifolia) is obtained from the leaves of a tree grown in Australia and has a wide range of uses including the treatment of warts, cold sores, athlete's foot, thrush and skin infections. It helps colds and flu and can be soothing for tired feet. One of the few oils which can be used neat in an emergency. Take on holiday too if you get bitten by insects!
Use 3 or 4 drops of tea tree in a bath may help ease aches and pains.