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The mask of deficiency: A rare case of facial hyperpigmentation in vitamin B12 deficiency - a case report and review of literature.

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Title: The mask of deficiency: A rare case of facial hyperpigmentation in vitamin B12 deficiency - a case report and review of literature.
Authors: Viswanathan RA; Assistant professor, Department of General Medicine, Sri Manakula Vinayagar Medical College and Hospital, Puducherry, India.
Source: Tropical doctor [Trop Doct] 2026 Jan; Vol. 56 (1), pp. 215-218. Date of Electronic Publication: 2025 Sep 16.
Publication Type: Journal Article; Case Reports; Review
Journal Info: Publisher: Sage Country of Publication: England NLM ID: 1301706 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1758-1133 (Electronic) Linking ISSN: 00494755 NLM ISO Abbreviation: Trop Doct Subsets: MEDLINE
Database: MEDLINE Ultimate
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  Data: <searchLink fieldCode="AU" term="%22Viswanathan+RA%22">Viswanathan RA</searchLink>; Assistant professor, Department of General Medicine, Sri Manakula Vinayagar Medical College and Hospital, Puducherry, India.
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  Data: <i>Publisher: </i><searchLink fieldCode="PB" term="%22Sage%22">Sage </searchLink><i>Country of Publication: </i>England <i>NLM ID: </i>1301706 <i>Publication Model: </i>Print-Electronic <i>Cited Medium: </i>Internet <i>ISSN: </i>1758-1133 (Electronic) <i>Linking ISSN: </i><searchLink fieldCode="IS" term="%2200494755%22">00494755 </searchLink><i>NLM ISO Abbreviation: </i>Trop Doct <i>Subsets: </i>MEDLINE
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        Value: 10.1177/00494755251378821
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      – Code: eng
        Text: English
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        StartPage: 215
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      – TitleFull: The mask of deficiency: A rare case of facial hyperpigmentation in vitamin B12 deficiency - a case report and review of literature.
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            – D: 01
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              Text: 2026 Jan
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