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.
Especially places where your feet may be exposed to water, such as around public pools, beach showers, gyms and amusement parks. But generally, you could get it from any where even your own home. The answer to what causes black toe nail fungus is microscopic fungi spores that thrive in damp areas.