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.
Oxygenated hemoglobin is bright red, while deoxygenated hemoglobin is bluish. There are two main categories of cyanosis: central and peripheral. Central cyanosis causes a bluish colour in the lips, tongue, and skin, especially the fingers and toes. Peripheral cyanosis is seen only in the fingers and toes. Cyanosis caused by congenital heart conditions is often seen soon after birth, but sometimes it does not appear until a baby is older.