Antifungal Fungus Killer For treatment of fungal infections of the skin by inhibiting the growth and reproduction of fungal cells. Treats fungal infections of hands Has F.D.A. approved ingredient Micomazole Nitrate Fungus killer tested and approved with an N.D.C. Usage Tips Clean the affected area and dry thoroughly. Use glass dropper to apply a thin layer of product over affected area twice daily (morning and night) or as directed by a doctor. .25 fl oz.