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 most common causes of yellow or brown fingernails are the frequent use of nail polish and cigarette smoking. Taking a break on the polish or quitting smoking may allow the dark nail to grow out as the new nail comes in.