A device having medical and veterinary applications of light to antimicrobial and antineoplastic chemicals includes a solution retainer adapted to retain a therapeutic solution against a user, the therapeutic solution including an antimicrobial chemical, an antineoplastic chemical, or both; a fiber optic cable; a light termination on the fiber optic cable that provides light from the fiber optic cable to the therapeutic solution in the solution retainer; and a light source that provides a light of a predetermined wavelength to the fiber optic cable; wherein the light provides a synergistic effect in the therapeutic solution that inhibits microbial or neoplastic growth.