Abstract: Provided is a method of improving skin condition by applying to the skin of a subject a cosmetic composition comprising black yeast-derived exosomes as an active ingredient and thereby improving the skin condition, particularly skin elasticity improvement, skin wrinkle reduction, skin texture improvement, skin tone improvement, skin brightness improvement, skin regeneration, skin moisturization, and/or whitening.

Abstract: Provided are an Aspergillus oryzae LGYM4 strain; a red ginseng fermentation product including the strain or a fermentation product thereof: a food composition, a cosmetic composition, a quasi-drug composition, and a pharmaceutical composition, each including the red ginseng fermentation product; a method of preparing the red ginseng fermentation product, the method including the step of performing a fermentation by inoculating the strain into a composition including red ginseng; a red ginseng fermentation product prepared according to the preparation method; and a food composition, a cosmetic composition, a quasi-drug composition, and a pharmaceutical composition, each including the prepared red ginseng fermentation product.