Abstract: Superoxide dismutase (SOD), preferably rhSOD, is used in liposomes, optionally mixed with hyaluronic acid and/or at least one physiologically acceptable carrier, and other optional additives, to prepare a pharmaceutical composition useful against increased concentrations of superoxide radicals and/or the damage caused thereby. The compositions are administered topically, preferably as gels or ointments, to prevent and/or heal human fibrotic tissue degeneration diseases, in particular induratio penis plastica (Peyronie's Disease).