 pellagra is a nutritional disorder secondary to niacin deficiency . 
 the classical triad is dermatitis , diarrhea , and dementia . 
 we report the case of a young girl with hypermobility - type ehlers  danlos syndrome who exhibited the classical pellagra symptoms , despite apparent adequate nutritional intake . 
 her condition resolved after oral niacin supplements were administered . 
 although this association has not previously been recognized , an inherited connective tissue disorder may be related to the appearance of pellagra . 
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