"Tee tree oil is antiviral, antifungal an anti-inflamatory; many of its attributes, including its immunostimulant effects, are no doubt due to its extremely powerful bactericidal properties.  Applied before radiotherapy, it has been proved to protect the skin from the deep burning effects."

Reference:  Shirley Price "Aromatherapy workbook", Thorsons, San Francisco, CA, 1993, p. 81.