Housecall: management of rash under breast

I went to make a housecall to see a bedbound lady with rash in the deep fold under her breasts.  Her son who takes exemplary care of her has tried different creams, talc and starch without success.
Solution: split sides of a pillow case to make a long rectangular cloth.  Fold it lengthwise and wrapped around her chest and push her breasts upwards as to hold the deep fold under the breast open to air.  I’ll check next week and see if that helps.