hyperpigmentation went away with b12 injection as a Primary Symptom of Vitamin Deficiency: A Case Report Reversible Hyperpigmentation in a Patient
Reversible Hyperpigmentation in a Patient With Vitamin B12 Deficiency Cureus Reversible Facial Hyperpigmentation Associated With Vitamin B12 Deficiency Tayem 2017 Nutrition in Clinical Practice Wiley Online Library Knuckle Pigmentation as an Early Cutaneous Sign of Vitamin B12 Deficiency: A Case Report PMC Dermatological Conundrum: Puzzling Pigmentation in Vitamin B12 Deficiency and Addison's Disease
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