The present invention relates to an external preparation for skin comprising a compound, such as centaureidin(5,7-dihydroxy-3,6-dimethoxy-2-(5-hydroxy-4-methoxyphenyl)-4H-1-benzopyran-4-one)； 5,7-dihydroxy-3,6,8-trimethoxy-2-(3,4,5-trihydroxyphenyl)-4H-1-benzopyran-4-one； 3,5-diethoxy-6,7-dimethoxy-2-(5-ethoxy-4-methoxyphenyl)-4H-1-benzopyran-4-one； and 5,6-dihydroxy-3,7-dimethoxy-2-(5-hydroxy-2,4-dimethoxyphenyl)-4H-1-benzopyran-4-one； and/or salt thereof and 4-n-butyl resorcinol and/or a salt thereof. <；??>；The present invention provides an external preparation for skin having a function as a substantial lightening cosmetic that exerts whitening action of inhibiting excessive melanin production and keeping natural-looking whiteness.과잉의 멜라닌 생성을 억제하고, 자연스러운 느낌이 드는 밝기를 유지하면서, 미백 작용을 발휘하는 실질적인 라이트닝 화장료로서의 기능을 갖는 피부 외용제를 제공하는 것을 과제로 한다. 본 발명은 센타우레이딘(5,7-디하이드록시-3,6-디메톡시-2-(5-하이드록시-4-메톡시페닐)-4H-1-벤조피란-4-온), 5,7-디하이드록시-3,6,8-트리메톡시-2-(3,4,5-트리하이드록시페닐)-4H-1-벤조피란-4-온, 3,5-디에톡시-6,7-디메톡시-2-(5-에톡시-4-메톡시페닐)-4H-1-벤조피란-4-온, 또는 5,6-디하이드록시-3,7-디메톡시-2-(5-하이드록시-2,4-디메톡시페닐)-4H-1-벤조피란-4-온 등의 화합물 및/또는 이의 염과, 4-n-부틸레조르시놀 및/또는 이의 염을 배합한 피부 외용제에 관한 것이다.
