Bilaterally symmetrical lesions of the neck that represent a portion of the skin’s involvement in pellagra. The lesions begin as erythemas and progress to vesiculation and crusting.
A distinctive red rash that forms a well-defined ring around the neck is a characteristic symptom of pellagra, a condition caused by a deficiency of the B vitamin niacin in the diet. This skin manifestation serves as an important indicator of the underlying disorder.