Skin peeling and redness after breast cancer radiotherapy may be caused by radioactive dermatitis. If skin peeling occurs after radiotherapy for breast cancer, it is mainly considered that the side effect of radiotherapy causes radiation dermatitis. If the skin is simply peeling off, there is no broken infection, there is no need for special treatment, pay attention to good protection, wear cotton underwear to avoid friction factors such as stimulation. If the color of the peeling skin is red and broken, you can apply erythromycin ointment to prevent infection and increase diet and nutrition to improve immunity to promote recovery. In addition to the above factors, do not rule out other factors, such as allergies. It is recommended that patients go to the hospital as soon as possible for examination, and after the doctor clarifies the cause of the disease, targeted treatment will be given.