HENSHAW, E. B.; OKAFOR, L. E.; EKPENYONG, H. J. Cutaneous hyperpigmentation as a diagnostic marker of vitamin B12 deficiency: a case report. International Journal of Research in Dermatology, [S. l.], v. 8, n. 3, p. 353–357, 2022. DOI: 10.18203/issn.2455-4529.IntJResDermatol20221015. Disponível em: https://www.ijord.com/index.php/ijord/article/view/1541. Acesso em: 13 oct. 2025.