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 leaves or flowers with white or dark spots can result from a fungal infection in the plant. Fungal infections are often a result of soil that is too moist, or of leaves and flowers that are damp from watering or humidity.