Redness and swelling after circumcision may be a normal reaction after surgery, or it may be due to infection. 1. Normal reaction: circumcision is an invasive surgery, in the process of removing the excessively long foreskin will damage the surrounding tissues, blood vessels, which may cause redness and swelling, most of which can be relieved after a few days. 2. Infection: If you don’t take good care of yourself after circumcision, you may have an infection. Patients may show redness and swelling of the surgical site, which may also be accompanied by pain and purulent secretions, etc. It is necessary to disinfect the wound and take oral antibiotics to fight infection, such as ceftazidime, ceftriaxone, azithromycin, etc. Localized redness and swelling after circumcision, it is recommended to go to a regular hospital, by a professional doctor for diagnosis and treatment.