A previously healthy 4-year-old female presets with a rash and sore mouth. About 2 weeks earlier, she had a fever with hoarse voice. She was diagnosed with a viral illness, which lasted 4 days. She seemed to be well for a while, but a few days ago, she had the onset of a rash on her face, spreading to the trunk and extremities along with some oral sores and subjective fever. Her intake has been poor due to pain in her mouth, and she was referred for admission for dehydration, and further evaluation. Examination revealed normal vital signs, and a rash consisting of about 50 discrete, round erythematous lesions of various sizes, with many containing dark to black centers a few with small vesicles in the center. Her lips were covered with numerous discrete ulcerative lesions, with some dried blood. Her mouth had similar discrete, ulcerative lesions throughout. Her eyes and other mucous membrane surfaces were clear. HINT: She presented to her primary 8-months later with a similar episode of mouth sores without skin lesions.