Inflammation of the foreskin may be caused by fungal infection, and may also be related to other factors such as infection by other pathogens, trauma, allergies and so on. 1. Fungal infection: Fungal infection of the foreskin induces inflammation of the foreskin, which leads to redness, swelling, pain, itching and other uncomfortable symptoms. 2. Other pathogenic infections: bacterial infections, trichomonas infections and viral infections can also lead to inflammation of the foreskin. 3. Trauma: Inflammation of the foreskin can be caused by external injuries to the affected area. 4. Allergies: Allergies to toiletries or condoms can also lead to this condition. In addition to the above causes, there may be other factors related to the inflammation of the foreskin. You should go to a regular hospital in time to clarify the cause of the disease and follow the doctor’s instructions for treatment to avoid adverse consequences.