The white patches on the glans and foreskin are painless and itchy with hyperplasia, and the possible clinical causes are foreskin scale, vitiligo, and white patches of mucous membranes formed by external stimuli. 1. circumcision: some people do not do a good job of daily cleaning of private parts, sweat and other secretions of the residue will make the glans, foreskin and other parts of the local skin formation of circumcision, the appearance of white patches. 2. Vitiligo: this disease is a common clinical type of skin disease, its onset is usually associated with genetic factors, and therefore not contagious. The people who suffer from this disease may have white patches all over their body, but not accompanied by itching, pain and other symptoms, can cause serious impact on the aesthetic. 3. Mucosal white spots formed by external stimulation: some people’s glans, foreskin and other parts of the glans are frequently subjected to mechanical or physical stimulation, which may change the nature of local skin epidermal cells and cause pigment loss, thus forming mucosal white spots, which may be a sign of precancerous lesions, and it is recommended to seek medical treatment in the hospital. To summarize, if it is a disease factor, it is recommended to go to the urology department or dermatology department of the hospital for consultation and treatment as soon as possible.