The invention includes a method of treating a mammal comprising topically applying an aqueous composition to a target site on the mammal, wherein the aqueous composition comprises: active ingredients comprising i) a cosmetic dye selected from a violet, blue or green dye, or combinations thereof, and ii) an enhancing ingredient, wherein the relative weight percentage of the cosmetic dye to the enhancing ingredient is about 1:2 to about 40:1, wherein the cosmetic dye interacts with keratinous material thereby i) substantially staining the target site and ii) inhibiting the active ingredients from significantly leaching from the target site.