The present invention relates to a skin preparation containing fermented soybean paste, which has been traditionally called as ‘Chungkookjang’ in Korea. Further, the skin preparation of present invention has a useful effect for preventing or treating the atopic dermatitis by the active ingredients contained in Chungkookjang. Further, the skin preparation consists of soap and lotion containing fermented soybean paste, wherein i) said soap contains the high molecular weight materials or water insoluble materials in fermented soybean paste, such as, edible fiber, polysaccharide, proteins, lipids and/or water insoluble health functional materials； and ii) said lotion contains the low molecular weight materials or water soluble ions in fermented soybean paste, such as, low molecular weight of sugar, oligo-saccharide, amino acid, peptide and/or water soluble health functional materials
