Prophylactic or ameliorating agent fo pigmentation

摘要

Disclosed is an external preparation for skin, which is suitable for the prevention or amelioration of pigmentation. Specifically disclosed are: a prophylactic or ameliorating agent for pigmentation, comprising a compound represented by general formula (1) or an isomer and/or a pharmacologically acceptable salt thereof; and an external preparation for skin, containing the component. [In the formula, R represents a unsubstituted aromatic group or an aromatic group having a substituent; R represents a hydrogen atom, a linear or branched C alkyl group, or an acyl group having a linear or branched C alkyl chain; and R represents a hydrogen atom, or a linear or branched C alkyl group.]