Figure 2: The blotch-decreasing effect on the skin by hydrogen-rich water bath. Note: The female, 41 years old, with her informed consent. Immersion in warm hydrogen-rich water bath (41°C) for 10 minutes was performed once a day for 1 month. (A) Before hydrogen-rich water treatment. (B) One month after hydrogen-rich water treatment, the spots decreased and the densely brownish color became lighter.