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Pellagra is a forgotten disease, particularly in developed countries. It is a nutritional disorder characterized by 4 “Ds”: diarrhea, dermatitis, dementia, and death. Causes of pellagra are chronic alcoholism, inadequate diet, malabsorption, metabolic derangement and drugs. Half-and-half nail is an occasional but specific clinical finding in chronic renal failure. We report a case of Isoniazid-induced pellagra associated with half-and-half nail.

Letter to the Editor Half-and-half nail in a case of isoniazid-induced pellagra