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.
A Fungus Among Us. Various diseases attack and damage grass, resulting in unsightly brown spots. Hot, humid weather provides the conditions needed by lawn fungus, which creates round patches of brown grass up to several feet in diameter. However, some fungal diseases attack lawns even in cold weather.