Quiz 3: 12 year old girl with rash

This picture is of a 12 year old girl who presented with a rash on her left cheek. The rash developed gradually over 2 weeks. Erosions that appeared initially healed without scarring. She did not give history of fever, photosensitivity, insect bite, recent vaccinations or contact with individuals with rash. The past medical history was unremarkable.

Question: What is the diagnosis?