Vitiligo is not contagious, and it will not be transmitted to others through contact once it appears. However, this disease does tend to have a genetic predisposition. The main factors contributing to vitiligo include decreased immunity, a deficiency of copper in the body, localized trauma, or genetic heredity. There are also some reasons that cannot be fully identified through medical examination. After vitiligo appears, its progression varies from person to person. Some patients experience rapid development, with the affected area expanding significantly within a few months, while others see slower progression. Generally, if the spread is quick, it is necessary to seek routine treatment promptly. If the affected area is small and the progression is very slow, it might be reasonable to observe for a while to monitor the development of the patches before deciding on the treatment approach. In any case, it is crucial to take vitiligo seriously upon its onset, continuously observe its progression, consult a doctor to assess the severity of the condition, and receive appropriate treatment.