Emergency Medicine

Answer 1 Pityriasis rosea. Pityriasis rosea is a benign, self-limited rash that is common in adolescents. A viral prodrome often precedes the eruption of skin lesions in this disease. The rash usually reaches its peak in approximately 2 weeks and fades over 4 to 6 weeks. Contact dermatitis is often characterized by well-demarcated erythema, which is triggered by contact with an environmental irritant. Nummular eczema is an acute papulovesicular eruption. Rhus dermatitis is the most common allergic contact dermatitis caused by exposure to poison ivy. Tinea corporis, commonly known as “ringworm,” is a superficial fungal skin infection. 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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