The present invention relates to methods of treating or preventing an infection or infectious disease in a mammal, or sanitizing mammalian tissue, or treating or preventing psoriasis in a mammal, comprising topically administering to said mammal an electrolytic acid water comprising free chlorine, wherein: a) from 90% to 99.9% of said free chlorine is present in the form of hypochlorous acid； b) said water has a pH of from 0.5 to 5.0； and c) said water has oxidation reduction potential (ORP) of greater than 1100 mV. The present invention also relates to methods of healing, repair or regeneration of a tissue in a mammal comprising topically administering to said tissue said electrolytic acid water.
