The present disclosure relates to methods and compositions for suppressing the growth of microorganisms on selected areas of the skin for an extended period of time, such as one hour, twenty four hours, seventy two hours, or longer. An area of the skin is selected for the suppression of the growth of microorganisms and a microorganism growth suppressing agent is topically applied to the selected area of the skin. The microorganism growth suppressing agent may be comprised in a pharmacologically acceptable vehicle such as an emulsion or soap. The microorganism growth suppressing agent comprises free conjugated fatty acid such as conjugated linoleic acid.