Itchy and swollen foreskin can be caused by external stimulation, foreskin infection, or foreskin allergic diseases. 1. External stimulation: for example, external pressure, friction, trauma or frequent masturbation, excessive sexual intercourse will cause the symptoms of itchy and swollen foreskin. 2. Infection of the foreskin: for example, bacteria, trichomonas, candida and other pathogenic bacteria infection, caused by phimosis can also cause itchy and swollen foreskin. 3. Foreskin allergic diseases: for example, allergic hives, contact dermatitis, drug rash, etc., can also cause itchy and swollen foreskin sensation. To summarize, there may be other reasons for the itchy swollen foreskin, you need to go to the hospital in time to check, follow the doctor’s instructions for treatment, the cause of the different, the treatment measures are not the same.