A blend for steam inhalation for sinusitis: 3 drops of Peppermint, 2 drops of Thyme, 2 drops of Tea Tree. Place in a large bowl of boiling water, cover the head with a towel and inhale the steam. Please take care of the boiling water. Never pour essential oils direct or undiluted in water or to your skin: mix a few drops of essential oil in a base oil, whole milk or cream, and add it to bath water, or a shower gel. 5 to 10 drops of essential oil are sufficient per 10ml of base oil.