Hello My Wife Was Giving Fluconazole 150 Mg 1 Time

hello my wife was giving fluconazole 150 mg 1 time a day for 5 days she has i guess some thing around her butt hole so the doc gave her this med for it plus i have to put some cream around this spot also to help heal it up . can you tell me what this med is for and is it a good med ? thank you