Swelling of the penile ligament may be due to acute injury, or it may be related to factors such as circumcision and allergy. 1. Acute injury: Acute injury to the penile area, such as excessive masturbation or excessive pressure, resulting in damage to the tethered area, may cause swelling of the tethered area, accompanied by pain, redness and other symptoms. 2. Inflammation of the foreskin and glans: for example, bacterial or fungal inflammation of the foreskin and glans, stimulated by inflammatory substances, may cause swelling of the penile ligament, accompanied by oozing, itching, erythema and other symptoms. 3. Allergy: for example, allergy to underwear or condom allergy, so that the penile ligament allergic reaction, may cause swelling of the penile ligament, accompanied by intense itching, tingling and other symptoms. Swelling of the penile ligament indicates the existence of abnormalities, and it is recommended to go to the urology department of the hospital for examination and treatment.