A survey of knowledge and nursing practice in relation to sub-mammary skin problems was conducted among ward sisters and primary nurses in one district health authority Respondents identified a number of characteristics as predisposing factors, with obesity and poor hygiene being mentioned most frequently A very wide selection of nursing interventions was recommended, with nurses who mentioned pharmacologically active topical preparations reporting a significantly greater number of recurrences among patients than those who relied on less sophisticated regimes Nurses expressed a variety of opinions about the effect that this condition has on patients, ranging from no effect at all to pain and discomfort These findings highlight the lack of a coherent strategy for treating this problem and support the continuation of a research programme examining sub-mammary skin problems and the nursing response to them