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.
It's a superficial infection of the stratum corneum of the skin, causing brown to black lesions on the palm (mainly) and the sole of the foot (occasionally): â¢ Pigmentation is more intense near the border. â¢ Only outer, dead layers of the skin are affected.