Vitamin B3 deficiency lasting for few months [7] causes pellagra (Italian pella agra = rough skin) with «four D» symptoms: dermatitis with burn - like blisters and later rough, scaly and
painful, but not itchy, lesions on the sun - exposed areas (face, extension side of the hands / arms and leg /
feet), diarrhea, dementia and death (if not
treated)[1].