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Answers to the following quiz questions can be found on page 120.
Case 1: An otherwise healthy 6-month-old boy presents with several patches of alopecia, slowly increasing in size over the past month. He is noted to have two school-aged brothers at home. On examination, there is an erythematous, boggy mass on the scalp with associated alopecia and occipital lymphadenopathy (figure 1). What is the most likely diagnosis?