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Reversible melanonychia

BMJ 2017; 358 doi: (Published 31 August 2017) Cite this as: BMJ 2017;358:j3499
  1. Kundan Mishra, postdoctoral fellow,
  2. Aditya Jandial, postdoctoral fellow,
  3. Alka Khadwal, associate professor,
  4. Pankaj Malhotra, professor
  1. Department of internal medicine, Post Graduate Institute of Medical Education and Research, Chandigarh, India
  1. Correspondence to K Mishra mishrak20{at}

A 13 year old boy who had been taking hydroxyurea for two weeks for a suspected myeloproliferative neoplasm presented with blackish discoloration of his fingernails. Horizontal brown-black …

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