PROBLEM TO BE SOLVED: To obtain a preparation for external use for skin having synergistically improved skin chapping preventing and improving effects, effective for increasing the moisture retaining effect, free from stickiness and exhibiting excellent usability by using a low molecular weight betaine having moisture retaining effect in combination with a specific compound. SOLUTION: A low molecular weight betaine is used in combination with trehalose and/or erythritol. The low molecular weight betaine is preferably a quaternary ammonium salt of the formula (R<1> to R<3> are each a 1-6C alkyl; (n) is 0 or a positive integer; the total of the sum of the carbon numbers of R<1> to R<3> and (n) is <=8), especially trimethylglycine. The amount of the low molecular weight betaine is 0.01-30wt.%, especially 0.1-10wt.% in the total preparation and that of trehalose and/or erythritol is preferably 0.05-30wt.%, especially 1-20wt.%. The agent is applied to the outer skin in the form of cosmetics, drugs, quasi-drugs, etc.
【課題】 優れた肌荒れ防止、改善効果を有するととも に、べたつき感がなく使用性に優れ、かつ保湿効果の高 い皮膚外用剤を提供する。
【解決手段】 低分子ベタインとトレハロースおよび／ またはエリトリトールを含有してなる、皮膚外用剤。