White spots on genital skin are considered to be caused by vitiligo, florid chaff rash, sclerosing moss and other diseases. 1. Vitiligo: a disease caused by the destruction of melanocytes, mainly manifested as white patches on the skin, which can appear in any part of the body. The cause may be related to neurochemicals, heredity and other factors. 2. florid chaff rash: the initial manifestation of point-like rash, with the development of time gradually increased, light red, white, etc., can be seen in the perineum, foreskin and other parts. The cause of the disease is mainly related to Malassezia infection, heredity, environment, immune system inhibition and other factors can also induce the disease. 3. Sclerosing moss: the etiology is unknown, may be caused with chronic inflammatory stimulation, malnutrition, etc., can also lead to white spots on the genital area, with varying degrees of atrophy on the surface and occasional itching. There are more diseases that cause white spots on the genital skin, so it is recommended to go to a regular hospital for examination and to clarify the cause of the disease.