Emergency Medicine

Answer 2 Erythema nodosum. The described rash most likely represents a hypersensitivity reaction that is most often seen in children younger than 10 years. Erythema multiforme is an acute hypersensitivity reaction that can be caused by various infections or medications. Fixed drug eruptions occur in the same cutaneous site after re-exposure to an offending medication. Hereditary angioedema is characterized by recurrent bouts of swelling that can involve the face, extremities, and gastrointestinal tract. Urticaria, commonly known as “hives,” is characterized by well-demarcated skin wheals. SUGGESTED READING 1. Zitelli BJ, Davis HW, editors. Atlas of pediatric physical diagnosis. 3rd ed. St. Louis: Mosby-Wolfe; 1997. Click here to return to the questions

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