Biafine Cream to Reduce Side Effects of Radiation Therapy in Patients Receiving Treatment for Advanced Head and Neck Cancer

head and neck cancer, skin reactions secondary to radiation therapy, stage iii squamous cell carcinoma of the lip and oral cavity, stage iv squamous cell carcinoma of the lip and oral cavity, stage iii squamous cell carcinoma of the oropharynx, stage iv squamous cell carcinoma of the oropharynx, stage iii squamous cell carcinoma of the hypopharynx, stage iv squamous cell carcinoma of the hypopharynx, stage iii squamous cell carcinoma of the larynx, stage iv squamous cell carcinoma of the larynx, interventional, phase3