<qa>  What is the goal of this study?Objectives: The objectives of this study are to compare the severity of skin reactions of patients with a deep inframammary skin fold undergoing whole breast radiotherapy using the Radiation Therapy Oncology Group scoring system, as well as a supplementary scoring system between the experimental arm and the control arm, and to compare the severity of breast- related symptoms using visual analogue scales, topical steroid use and analgesic use between the two study arms. 