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This patient sought medical attention for diarrhea.

2. pellagra

Niacin (vitamin B 3 ) deficiency. The dermatologic features of this disorder include desquamation, erythema, scaling, and keratosis of sun-exposed areas, allof which this patient had. Note below the absence of changes in the sun-shielded area.

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Source:  OpenStax, Images of memorable cases: 50 years at the bedside. OpenStax CNX. Dec 08, 2008 Download for free at http://cnx.org/content/col10449/1.7
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