A 6-month-old girl presents with a two month history of a rash in her diaper area. Past medical history is unremarkable.

Her mother has tried using over the counter barrier creams and antifungal medications for the past four weeks without improvement. Her parents state that she has occasionally been feverish to 39°C over the past month, but attributed this low grade fever to an upper respiratory infection.

On examination, you notice the rash in the photograph above. She also has diffuse scaling of the scalp and appears fussy.

Which of the following diagnosis are the most appropriate?