An unselected, mycologically-controlled trial was conducted at the University Children's Hospital of Graz on the treatment of nappy rash by the topical application of Canesten (clotrimazole), a broad-spectrum mycotic in the form of a 1% cream. 56 children, ranging in age from 3 weeks to 41/2 years, were treated for thrush, principally located in the genital area. Only some of the children were admitted primarily on account of the oral and/or perianal moniliasis. The majority of the children were hospitalized for some other reason and thrush was diagnosed as an accompanying condition. Candida albicans proved to be the most frequent pathogenic organism. The results of therapy were judged according to mycological and clinical criteria. The mycological findings became negative in 54 out of the 56 children. Clinical improvement was apparent in all cases between the 5th and 10th day of therapy; complete recovery occurred between the 5th and 25th day, depending on the extent and localization of the moniliasis. One child showed improvement in, but not recovery from the disease, because therapy was interrupted on premature discharge from hospital. Therapy was unsuccessful in the remaining child, although slight improvement occurred. Tolerance was good in all patients on application of Canesten cream thrice daily.