hyperpigmentation went away with b12 injection These findings are classically associated vitamin deficiency., Knuckle and skin is a well-documented clinical sign of B12 deficiency., Other possible symptoms include:, Recreational Nitrous Oxide Abuse-Induced Vitamin
Recreational Nitrous Oxide Abuse Induced Vitamin B12 Deficiency in a Patient Presenting with Hyperpigmentation of the Skin PMC The Impact of Vitamin B12 Deficiency on Skin Health KayaKalp Hyperpigmentation as a Primary Symptom of Vitamin B12 Deficiency: A Case Report PMC Reversible Hyperpigmentation due to Vitamin B12 Deficiency Mimicking Addison's Pigmentation Indian Journal of Postgraduate Dermatology Cobalamin F deficiency in a girl with severe skin hyperpigmentation and a homozygous LMBRD1 variant Braz 2022 Clinical and Experimental Dermatology Wiley Online Library
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