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pellagra (n.)

chronic disease caused by dietary deficiency (formerly blamed on diseased grain) and characterized by dry, red skin, 1811, from Italian (1770s); according to Watkins, a hybrid formed from Latin pellis "skin" (from PIE root *pel- (3) "skin, hide") + Greek agra "a catching, seizure," related to agrein "to take, seize." But OED suggests it might be originally Italian pelle agra "rough skin." Related: Pellagrous.

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Definitions of pellagra

pellagra (n.)
a disease caused by deficiency of niacin or tryptophan (or by a defect in the metabolic conversion of tryptophan to niacin); characterized by gastrointestinal disturbances and erythema and nervous or mental disorders; may be caused by malnutrition or alcoholism or other nutritional impairments;
Synonyms: Alpine scurvy / mal de la rosa / mal rosso / maidism / mayidism / Saint Ignatius' itch
From wordnet.princeton.edu