Disclosed is a composition for growing hair by topical application comprising: at least one penetration enhancer； and 0.01% to 5% w/w bimatoprost represented by the chemical structure shown herein, wherein said composition is formulated for topical administration to the skin, wherein the penetration enhancer comprises a combination of a first penetration enhancer group comprising ethanol, propylene glycol, and diethylene glycol monoethyl ether； and a second penetration enhancer group comprising an effective amount of at least two compounds selected from the group consisting of glycerol monooleate, oleic acid, and benzyl alcohol.
