The surname Nguyen is believed to have originated in the Chinese surname Ruan (in the Mandarin language) or Yuen (Cantonese), owing to Chinaâs long domination over Vietnam.
Tinea nigra is a fungal infection that is mainly seen on the palms of the hands or soles of the feet causing a dark brown to black discoloration of the affected skin. The word tinea means a fungal infection and nigra means black.
The answer to what causes black toe nail fungus is microscopic fungi spores that thrive in damp areas. Walking barefoot greatly increases your chances of being exposed to this fungus. Nail fungus symptoms include flaking of the nail itself, as well as a general thickening of the nail.