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.
The fungus that causes brown leaf spot, Alternaria alternata, is closely related to early blight (Alternaria solani). Like early blight, brown leaf spot overwinters as spores and mycelia on the infected tissue of various Solanaceous hosts.