Persistent edema for 20 days after circumcision is a normal reaction after surgery. Usually the edema will subside in about a month. Edema after circumcision is a symptom caused by the blockage of tissue fluid and lymphatic fluid reflux and the leakage of tissue fluid outside the body. If there is no other discomfort, there is no need to worry too much. And edema recovery also has individual differences, some patients recover faster, some recover more slowly. If you have sex too soon after surgery or have frequent erections, it will also affect the recovery time of edema. At the same time, pay attention to the cleanliness and hygiene of the wound, wear loose clothing. Avoid local wound water, and observe whether there is local blood seepage and wound cracking, prohibit sexual life and masturbation within 1 month after the operation. If the patient has any discomfort, he should consult the doctor for examination and early treatment.