Men’s subcoronal foreskin edema may be caused by infection, allergy, trauma and other reasons. 1. Infection: if laser, electrocautery, circumcision surgery, etc. is carried out in the coronary groove and foreskin area, due to improper postoperative care, it triggers the infection of the foreskin and leads to edema of the foreskin. 2. Allergic urticaria: if the foreskin, penis and other parts of the mosquito bite, it will cause allergic urticaria, then the foreskin will have obvious edema, itching symptoms. 3. Foreskin injury: foreskin edema is a manifestation of foreskin injury, such as too much action during intercourse, or masturbation action is too violent, may cause the foreskin, penis trauma, which will cause foreskin edema, and even there will be vesiculation, oozing, bleeding and so on. Men’s subcoronal foreskin edema may also be caused by other factors, if the symptoms of men’s subcoronal foreskin edema, persistent and unrelieved, you need to go to the regular hospital in time for medical treatment.