There are white substances inside the foreskin, usually seen in the following cases: first, patients with prepuce, due to long-term inability to turn up the foreskin for glans and foreskin cleaning, resulting in the retention of foreskin scale; second, some young people or children due to lack of hygiene knowledge, even if the general foreskin is too long, plainly do not have the habit of turning up the foreskin for cleaning, will also lead to a large amount of white foreskin scale retention; third, mycotic glans Circumcision, this condition is usually seen in adult patients, the main symptom is itching of the penis head and penile skin, and sometimes there is a distinct burning sensation. Local examination can reveal significant redness of the coronal sulcus, head of the penis or inner foreskin plate, which may be swollen, and there will be scattered red papules. In addition, a large amount of tofu-like white dirt can be seen at the inner plate of the foreskin and the coronal sulcus. Some patients may also develop infection of the scrotum, when there can be flushing of the scrotal skin, accompanied by itching and pain, and the spouse may also develop the same gynecological symptoms, and this condition requires further examination and treatment at the hospital.