The foreskin of the prepuce can not be externally turned, the prepuce refers to the penile skin and the penis head adhesion, the prepuce mouth narrowing and other reasons, the prepuce mouth can not be turned over to reveal the whole penis head, to be circumcision surgery treatment. Because of the narrow opening of the foreskin of the prepuce, if forced to turn out of the open, in the process of turning out of the local pain, easy to tear, after turning out of the foreskin is easy to embedded in the coronal groove area of the penis, resulting in localized edema, in severe cases, it will cause ischemia or bruising of the head of the penis, necrosis, etc., so it is not recommended to turn out of the foreskin of the prepuce. The foreskin of the prepuce is easy to inlay, which will cause white spots on the head of the penis as well as inflammation of the head of the penis, and in serious cases, it will induce penile cancer. Patients with phimosis should go to regular hospitals for treatment in time.