pellagra, a skin condition caused by niacin deficiency, manifesting as rough and dry skin

dermatitis alcoholic alcohol niacin pellagra b3 deficiency dry beri skin forearm arm cracked scaly scales vitamin vitamins rough patches eczema tinea fungal lesions itchy itch itching pruritus problem limb rash rashes dehydration dehydrated upper health symptom sore lesion eczematous