The Kojic Acid Soap you have always trusted, the one prescribed by your dermatologist is now available in Kojie San Skin Lightening Soap. It has all the natural kojic acid formula that helps lighten dark spots due to acne, age spots, freckles, sun damaged skin, and other skin pigmentations. Kojic Acid was discovered in Japan. It is a by- product in the production of koji, or Malted Rice, for use in the manufacture of Japanese rice wine. In cosmetics, Kojic Acid is popularly known for its excellent whitening effects and anti-oxidant properties. Directions: Use daily as a regular soap for the face and body.The Kojic Acid Soap you have always trusted, the one prescribed by your dermatologist is now available in Kojie San Skin Lightening Soap. It has all the natural kojic acid formula that helps lighten dark spots due to acne, age spots, freckles, sun damaged skin, and other skin pigmentations. Kojic Acid was discovered in Japan. It is a by- product in the production of koji, or Malted Rice, for use in the manufacture of Japanese rice wine.