Black toenails can be caused by excessive formation of melanin pigments. Toenail discoloration is found in some circumstances, such as pinta diseases, vitamin B12 deficiency, cancer, and Peutz-Jegher syndrome. Besides above circumstances, toenail fungus can also cause discoloration of the nail. Fungal infection Candida albicans and Blastomyces dermatitis often causes black toenails. Junction Nevi can […]