Review Question - QID 108616

A 21-year-old female is being evaluated for worsening "flaky scalp." She does not remember exactly when it started, but reports it has been at least a couple months. Her symptoms then developed into a scaling patch at the top of her head. She has begun ritualistically and repetitively combing her hair to the left 3 times every time she feels any "flakes." The patient reports that in the past she chemically treated her hair, but stopped when she noticed the scalp scaling had developed into an area of balding. She admits to feeling tired lately and gained 5 lbs in the last 2 months, but admits she has been staying up late to study for exams. The patient's past medical history is significant for bipolar I disorder, for which she takes lithium, and acne, for which she uses topical salicylic acid. The patient reports fatigue, but denies headache, shortness of breath, chest pain, polyuria, hematuria, or other rashes. Vital signs include a temperature of 99°F (37°C), blood pressure of 122/76 mmHg, a pulse of 88/min, and an oxygen saturation of 99% on room air. Physical exam is negative except for scalp findings shown in Figure A. Routine lab values are drawn, including:
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