Penile edema is associated with trauma, inflammation, prepuce incarceration, tumors and other lesions. 1. trauma: due to the penis area suffered violence trauma or frequent masturbation, indulgence and other reasons, resulting in chronic injury to the penis, may lead to penile edema. 2. Inflammation: glans circumcision is the main, and personal hygiene is not clean, candida, herpes virus infection and other factors related to the occurrence of inflammation, edema of the foreskin, accompanied by pain, itching, skin ulceration and other manifestations. 3. Incarcerated foreskin: this situation is mostly seen in patients with prolonged foreskin and phimosis. As the foreskin wraps the glans, in the process of cleaning the genitals or masturbation, the foreskin will be turned over to reveal the glans, and then there is no timely reset of the foreskin tissue, the foreskin may be embedded, and there is local edema. 4. Tumor lesion: penile cancer is the main cause, and the symptoms are not obvious in the early stage of the lesion. After entering the middle or late stage of the lesion, the patients will have local lymphatic circulation disorder and may have penile edema. There may be other reasons for penile edema. Patients need to consult the doctor in time for examination and treatment.