Object The present invention provides a composition and fermented milk, which is derived from natural product, is highly safe, exhibits improvement effect and/or therapeutic effect on skin, and comprises fermented lactic acid bacteria excellent in manufacturability. Solving Means Disclosed are: use of Streptococcus thermophilus OLS3059 in skin improvement and/or treatment； a composition for skin improvement and/or treatment comprising Streptococcus thermophilus OLS3059 and/or a culture thereof； food and drink comprising the composition； fermented milk for skin improvement and/or treatment prepared by using Lactobacillus delbrueckii subspecies bulgaricus and Streptococcus thermophilus OLS3059； and the fermented milk for skin improvement and/or treatment further comprising collagen peptide and/or ceramide.
