Circumcision is performed on 12-year-old boys with recurrent local inflammation caused by prepuce or phimosis. In general, normal male newborns and infants may have congenital prepuce, to the age of 3 to 4 years old, as the penis grows and develops the foreskin retracts on its own, so that the head of the penis is exposed. During puberty, penile growth accelerates, and it is natural to expose the head of the penis during erection, while turning the foreskin back. When phimosis occurs, the foreskin cannot be naturally turned out with erection and needs to be turned up by hand. In the case of phimosis, the opening of the foreskin is narrow or the foreskin is attached to the head of the penis, and the foreskin cannot be turned up to expose the head of the penis. When the foreskin is long, it is easy to accumulate foreskin scale or stones under the skin, which is composed of sebaceous secretion and epithelial flakes, causing bacterial infection. If the foreskin cannot be turned up, and repeated infections occur, circumcision is recommended for 12-year-old boys. It is recommended that the patient go to the hospital in time, and consult a medical professional for advice.