(BMJ)—An 80-yo woman presented w/ an itchy rash on both hands and scalp x5mo. Symptomatic tx had been ineffective. Exam: dark, thickened skin on dorsal surfaces of hands bilaterally. Labs: antinuclear antibody neg; scalp bx showed scarring alopecia. What is the dx?
Riboflavin deficiency
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Pemphigus vulgaris
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Actinic reticuloid
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Pellagra
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Variegate porphyria
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