The narrow opening of the foreskin is considered to belong to the phimosis, usually can not be slowly turned large. The phimosis is due to the narrow opening of the foreskin, tightening in the glans, the foreskin can not be turned up, can not reveal the glans and the coronary groove of the phenomenon. The foreskin can not be slowly turned up, if blindly turn the foreskin, may cause the foreskin of the incarceration (narrow opening of the foreskin, due to external stimulation, incarceration in the penis above the coronal groove, can not return, will cause the distal foreskin and the head of the penis blood flow return obstacles, causing edema and bruising). There may also be due to the glans coronal sulcus dirt stimulation will cause complications such as circumcision glans dolichocele, serious and may also induce penile cancer and other malignant tumors type of disease. The narrowing of the opening of the foreskin, should go to the hospital as soon as possible for surgical treatment, so as not to cause complications.