Tea tree oil

Tea tree oil, or melaleuca oil, is an essential oil with a fresh camphoraceous odor and a color that ranges from pale yellow to nearly colorless and clear.

Tea tree oil is used for treating the following diseases: 

acne 
athlete's foot 
dandruff 
vaginitis 
thrush 
alveolysis 
furunculosis 
lice 
eczema 
psoriasis 
yeast infection 

Tea tree oil is also widely used as an antiseptic.