The invention provides a therapeutic composition, simultaneously containing (1) at least one polar solvent, selected from the group of a short-chain mono-alcohol and a diol; (2) between about 2% and about 25% of at least two keratolytic agents; and (3) a therapeutically safe and effective concentration of a antifungal agent It further provides a kit, consisting of an occlusive device and a therapeutic composition, useful for treatment of fungal skin infection.