Jamaican Bunny's Whitfield's Ointment Double Strength treatment for Fungus Infection of the Skin, 28g Jar. Whitfield's Ointment is an acidic ointment used for Treatment of Fungus Infections of the skin. It can have a slight burning effect that goes away after a few minutes. Whitfield's ointment is not advised for areas of thinner skin, such as the scrotum or the groin, and in such sites should only be used diluted to half-strength.