To distinguish whether a foreskin crack is a bacterial infection or a fungal infection, you can determine by the symptoms of local inflamed skin and examination of urethral secretions. 1. Symptoms of local inflamed skin: (1) Bacterial infection: the foreskin crack caused by bacterial infection will have obvious redness, swelling and pain. (2) Fungal infection: white secretion may be attached to the surface of the foreskin fissure, and the other parts of the glans are flushed and surrounded by red pimples, itching and other symptoms. 2. Urethral secretion examination: take the secretion of the urethra or the material on the surface of the inflamed area, and send it to the laboratory for microbiological culture examination, which can clarify whether it is a fungal or bacterial infection. Patients with foreskin fissures are advised to consult a doctor in time to complete the relevant examinations, clarify the cause of the disease, and follow the doctor’s instructions for treatment.