The foreskin is a common urological disease, and its examination is mainly through the doctor’s visual diagnosis, as follows: 1. It is necessary to check whether the foreskin mouth completely covers the glans or most of the glans, if this phenomenon exists, it is necessary to check whether the foreskin can be turned up to the coronal groove of the penis and whether the glans can be exposed naturally; 2. Can it be recovered. The foreskin mouth has a tearing sensation, and whether the glans can appear tight; 3, whether the last few drops of urine can be discharged when urinating, and in serious cases, the foreskin will even bulge when urinating, and urine will slowly flow out; 4, rub a lubricating substance on the penis to make the foreskin surface smooth, fix the penis with the left hand, and push the foreskin backward and flip it with the right hand, if the foreskin can be turned up smoothly, it is circumcised.