If there are white patches on the glans, then the possible causes: First, fungal glansitis, which can appear as white secretions on the glans surface, or cheese style secretions in the form of patches, attached to the glans surface, or attached around the glans ulcer, which can be accompanied by pain, redness and swelling of the glans, or local erosion, and may also be accompanied by erosion of the foreskin, etc. Local smear examination of secretions is needed to determine The second is the formation of mucosal white spots due to long-term mechanical or physical irritation, which have a smooth surface and hard texture without any painful sensation. Mostly due to long-term local skin stimulation, local excision is needed, which may be related to precancerous lesions; third, if there is a generalized white spot, it may suffer from vitiligo, except for the white spot of the glans, you can also see the white spot of the skin of the penis, or other parts of the body, you need to carry out the relevant dermatological consultation to confirm the diagnosis.