Dermatitis related to pellagra usually causes a rash on the face, lips, feet, or hands. In some people, dermatitis forms around the neck, a symptom known as Casal necklace.
Additional dermatitis symptoms include:
Red, flaky skin
Areas of discolouration, ranging from red to brown
Thick, crusty, scaly, or cracked skin
Itchy, burning patches of skin