After circumcision, the symptoms of enlarged testicles are mainly considered to be related to local infection, external injury and tumor disease. 1. Local infection: after circumcision, no good hygienic care work, leading to germs infection in the affected area, which can induce epididymitis, orchitis and other diseases, and then appear the symptoms of testicular enlargement. 2. External injury: testicular injury by external force can lead to congestion, redness and swelling of the affected area, which will lead to testicular enlargement. 3. Tumor disease: enlarged testicles may also be related to testicular cancer, testicular papilloma and other tumor diseases, which should be investigated in time. After circumcision, the symptoms of testicular enlargement must be taken seriously by the patients, and they should seek medical examination as soon as possible for targeted treatment.