 1. Women diagnosed with completely excised stage I or II invasive breast cancer, or DCIS, who have undergone breast-conserving surgery and are scheduled to undergo adjuvant breast radiotherapy will be eligible for this study if they are at increased risk of radiodermatitis at the inframammary fold due to breast size or shape i.e at least 2cm of skin apposition at the inframammary fold, andor brassiere cup size C or greater. 