This study aims to evaluate therapeutics interventions in radiodermatitis in patients with breast or head and neck cancer. The data collect is going to begin after determining the better dose in a dose-response curve that is being conduct now in the same institution. To evaluate the skin reaction will be applied scale of the Radiation Therapy Oncology Group (RTOG) - Acute Radiation Morbidity Scoring Criteria, Common Terminology Criteria for Adverse Events (CTCAE) and Radiation-Induced Skin Reaction Assessment Scale (RISRAS).