The nurse practitioner sees a six week old with her parents for an urgent care visit. The family is of southeast Asian ancestry. They voiced concern about “dark spots” over her lower back and buttocks that have developed over the past three weeks. The child was born after a full term pregnancy, went home with parents in 24 hours, has had an appropriate weight gain, and is meeting developmental milestones. On physical exam, the infant appears in no acute distress, and has blue to blue gr...