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CASE REPORT
Melanoderma: uncommon presentation of a common condition
  1. Priyadarshini Gunaseelan1,
  2. Sarveswari Narasingarajan2,
  3. Shriraam Mahadevan3,4
  1. 1Department of Family Medicine, Sundaram Medical Foundation Dr Rangarajan Memorial Hospital, Chennai, Tamil Nadu, India
  2. 2Sundaram Medical Foundation Dr Rangarajan Memorial Hospital, Chennai, Tamil Nadu, India
  3. 3Department of Endocrinology, Sundaram Medical Foundation Dr Rangarajan Memorial Hospital, Chennai, Tamil Nadu, India
  4. 4Department of Endocrinology, Endocrine & Specialty Clinic, Chennai, Tamil Nadu, India
  1. Correspondence to Dr Shriraam Mahadevan, mshriraam{at}gmail.com

Summary

A 64-year-old man presented with blackish pigmentation of skin and tongue for more than 2 years that did not improve with local remedies. He had no history of comorbid medical or surgical illnesses. General examination showed severe hyperpigmentation of skin and mucosa and also showed anaemia. Systemic examination was unremarkable except for Romberg sign and mild hyperreflexia. Adrenal insufficiency was ruled out by normal cortisol levels and haemogram showed macrocytosis with hypersegmented neutrophils suggestive of severe vitamin B12 deficiency which confirmed by low serum B12 levels. After 3 months of parenteral vitamin B12 treatment, the pigmentation and anaemia improved significantly. The mechanism of hyperpigmentation due to B12 deficiency is postulated to be increased melanin deposition in the basal layer of the epidermis. Since vitamin B12 deficiency is not uncommonly encountered in general practice, atypical presentation of this easily diagnosable and treatable condition is emphasised.

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Footnotes

  • Contributors PG was involved in the management of the patient, review of literature, manuscript preparation and review. SN was involved in diagnosis, management of the patient and manuscript review. SM was involved in diagnosis and management of the patient, manuscript preparation and literature review.

  • Competing interests None declared.

  • Patient consent Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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