White patches on the skin may be vitiligo, albinism, lichen planus, idiopathic leukoplakia and other diseases. 1. Vitiligo: due to oxidative stress, ultraviolet rays and other factors lead to the death of melanocytes, which triggers the skin to grow white spots. 2. Albinism: because of congenital pigment cell deficiency, too little pigment production, so the skin will appear the phenomenon of white spots. 3. lichen planus: when malassezia infects the skin, malassezia will damage the melanocytes of the skin, resulting in insufficient melanin production and finally white spots appear. 4. Idiopathic leukoplakia: the white spots are in the form of small dots and do not progress quickly, which may be idiopathic leukoplakia. It is recommended to go to the hospital in time for examination of the phenomenon of white spots on the skin, and actively treat it after clear diagnosis.