A Very Weak Young Girl with a Rash

The combination of increasing fatigue and muscle weakness, and a rash visible on this 7-year-old's face, legs, and hands may at first seem unrelated. Dr Jonathan Schneider walks you through the physical examination, providing visual clues and tossing out questions along the way. What are the unique features of the child's rash? What does the insidious onset of symptoms suggest? And, what is your diagnosis?