Vitiligo is a primary, limited or generalized skin pigmentation loss. Vitiligo can occur on any part of the skin. The white patches occur in exposed areas that are susceptible to friction and sunlight; especially on the face (e.g., between the eyebrows, inside the eyebrows, the root of the nose and the inside of the cheeks, in front of the ears and their upper parts, on the frontal hairline, and on the red part of the lips), the neck, the waist and abdomen (girdle), the sacral tail, and the back of the forearms and fingers. The typical white spots are mostly nail to coin sized, nearly round or oval, and later expand or fuse with each other into irregular large areas, but no matter how their shape changes, the edges of the white spots are always clearly visible, and there are islands of pigmented spots in the white spots. The degree of pigment loss varies from person to person, and varies from one part of the body to another, and even in the same part of the body, different shades can be displayed due to different degrees of depigmentation.