Sarah presents with her 4 month old daughter Grace as is she is concerned about her skin. She has a one month history of a itchy, diffuse rash on both cheeks. She is an otherwise well child and has no fever or rash elsewhere. On examination there is an ill defined erythema on both cheeks and her skin is generally dry. Sarah has been applying Aveeno cream but this is not helping much despite applying it twice daily.
Which one of the following statements is least correct regarding the management of her likely condition?