TLDR Vitamin B12 deficiency can cause skin darkening and other symptoms, which improve with B12 supplements.
A 28-year-old man exhibited localized hyperpigmentation, numbness, anorexia, and weight loss, which were attributed to vitamin B12 deficiency due to chronic atrophic gastritis. His symptoms improved significantly with B12 supplementation. This case underscored the need to consider B12 deficiency in patients with unexplained hyperpigmentation and atypical symptoms for early detection and treatment to prevent complications.
16 citations,
October 2007 in “PubMed” Vitamin B12 deficiency can cause skin darkening and white hair, but it's reversible.
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May 1984 in “Digestive diseases and sciences” A young woman's Cronkhite-Canada syndrome improved on its own after she gave birth.
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