Question category: Dermatology
A 72 year old female presents with a rash on her face. She states she had been unwell for a couple of days prior to the rash developing with malaise and fever and a few episodes of vomiting. On examination there is a bright fiery red, oedematous, warm, shiny area on the right side of her face, spreading from the paranasal area over the cheek, with borders which are sharply demarcated. This is painful, burning and itchy. Which of the following is the most likely diagnosis?