The red spot on the foreskin is generally considered to be caused by glansitis of the foreskin, and the local area should be kept clean to prevent secondary infection. If the symptoms are heavy, you can use iodophor solution, wipe once in the morning and once in the evening, or use anti-inflammatory ointment. If it is allergic glans, take oral anti-allergy medication, and when there is oozing erosion, use 3% boric acid water wet compress. In addition, the foreskin and penis head should be cleaned frequently to keep the foreskin cavity clean and dry, and good hygiene habits should be developed in general. For patients with long foreskin or circumcision, circumcision should be performed, all of which have a good preventive effect. If the disease once occurred, you can flip the affected foreskin, soak and clean with potassium permanganate solution, and apply antibiotics appropriately, and you can be cured within a few days.