Disclosed is an external preparation for skin that has a pH of 3.0-6.0 and that combines (A) a higher alcohol, (B) 0.01-5 mass% of a long-chain acylsulfonate anionic surfactant represented by the belowmentioned general formula (1) such as a stearoyl methyl taurate, and (C) 0.1-5 mass% of tranexamic acid. R1CO-a-(CH2)nSO3M1 (1) (R1CO- is a saturated or unsaturated fatty acid residue having an average of 10-22 carbon atoms； a is -O- or -NR2- (R2 is a hydrogen atom or an alkyl group having 1-3 carbon atoms)； M1 is a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or an organic amine； and n is an integer from 1 to 3.) As an external preparation that combines tranexamic acid, in the external preparation for skin, precipitation of tranexamic acid crystals does not occur.本發明係一種皮膚外用劑，其摻有(A)高級醇、(B)如硬脂醯基甲基牛磺酸鹽般之下述通式(1)所示之長鏈醯基磺酸鹽型陰離子性界面活性劑0.01～5質量%、(C)傳明酸(tranexamic acid)0.1～5質量%；並且其pH值為3.0～6.0。R1CO-a-(CH2)nSO3M1 (1)[R1CO-表示平均碳原子數10～22之飽和或不飽和脂肪酸殘基；a表示-O-或-NR2-(R2表示氫原子、或碳原子數1～3之烷基)；M1表示氫原子、鹼金屬類、鹼土金屬類、銨或有機胺類；n=1～3之整數]本發明之目的，係提供一種於摻有傳明酸之外用劑中，不析出傳明酸結晶之皮膚外用劑。
