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.
Dark brown color can be caused by elevated urine concentration or the presence of blood. Both require medical attention as they can represent serious health issues, including severe dehydration, hepatitis, jaundice, various liver conditions, bladder stones, infections or STDs.