Tea Tree Oil.

Treating fungal infections of the nails (onychomycosis) with a cream containing 2% betenafine and 5% tea tree oil cured 80% of patients. Topical application of tea tree oil cream for athlete’s foot (tinea pedis) reduces the symptoms of tinea pedis as effectively as tolnaftate, an over the counter antifungal medication.

Australasian Journal of Dermatology, July 2013