The foreskin stone is not a stone like kidney stone, gallstone, urethral stone, etc. The foreskin stone is a dirt polymer formed by the long-term accumulation of foreskin scale.
"If a person with a long foreskin does not open the foreskin and clean the glans for two or three days, they will find a layer of white material attached to the surface and coronal groove of the glans, which can appear as bean curd residue and have a fishy odor over time. This is foreskin scale.". Foreskin scaling is a mixture of foreskin secretions, urine, and other dirt. "The foreskin opening of a phimosis patient is too small to open, and the foreskin scale accumulates more and more.". Scald on the foreskin can easily breed bacteria, causing frequent infection and inflammation of the foreskin. Over time, foreskin stones gradually form.
"People with foreskin stones are generally phimosis patients, or those who have a long foreskin and do not open the foreskin for thorough cleaning.".
The greatest risk of foreskin stones is that they can cause cancer in the hair of the penis. The onset age of penile cancer is earlier than most cancers, and can occur even before the age of 20. More than 90% of penile cancer occurs in people with long foreskin or phimosis, indicating that the occurrence of penile cancer is directly related to foreskin scaling. In China, there are quite a few men with too long foreskin or phimosis, and many people lack the knowledge of physical health. They do not often open the foreskin for cleaning, and do not seek a doctor to perform circumcision, which increases the incidence rate of penis cancer.