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.
If it turns dark and itches when the temperature of the skin is raised, then it is most likely tinea versicolor. The itching usually subsides after sweat reaches the skin surface. In addition, if on a close observation of those white patches on your hands you see fine scales then they are caused by fungal infections.