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How Vitamin B12 Deficiency Affects Nails Core Med Science Dermatological Conundrum: Puzzling Pigmentation in Vitamin B12 Deficiency and Addison's Disease Total melanonychia of 20 nails as a rare manifestation of vitamin B12 deficiency PMC Vitamin B12 Deficiency and its Numerous Skin Manifestations Actas Dermo Sifiliogrficas Longitudinal Melanonychia: Brown Line on Nails
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