Total melanonychia of 20 nails as a rare manifestation of vitamin B12 deficiency

• Klinger S. Faico-Filho, MD,
• Renata S. Martins, MD,
• Carolina L. Santos, MD,
• Wagner A. Poles, MD,
• Renan B. de Mello, MD,
• Marina M. Moura-Faico, PhD

Affiliations

Klinger S. Faico-Filho, MD

Department of Medicine, Universidade Ferderal de São Paulo, São Paulo, Brazil; Correspondence to: Klinger S. Faico-Filho, MD, St Napoleão de Barros, 627, Vila Clementino, São Paulo–SP, Brazil.

Renata S. Martins, MD

Department of Medicine, Universidade Ferderal de São Paulo, São Paulo, Brazil

Carolina L. Santos, MD

Department of Medicine, Universidade Ferderal de São Paulo, São Paulo, Brazil

Wagner A. Poles, MD

Department of Medicine, Universidade Ferderal de São Paulo, São Paulo, Brazil

Renan B. de Mello, MD

Division of Dermatology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil

Marina M. Moura-Faico, PhD

Department of Medicine, Centro Universitário de Caratinga, Caratinga, Brazil