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.
Brown spots, also called liver spots or age spots, are caused by sun exposure. They occur most often on the face, the backs of the hands, and other areas often exposed to sun. They are sometimes tan-colored rather than brown and are medically known as lentigines. Melasma is another type of brown spot.