The reason for the long foreskin is mostly due to the fact that the growth of the penis is slower than the growth of the foreskin, which can then appear to be too long and wrap the glans and urethral opening. Under normal circumstances, men in the development process, the speed of penis development is faster than the speed of foreskin development, so the penis grows rapidly forward, the foreskin can naturally backward. In the development process, the two are not in full compliance with the principle of one fast and one slow, but synchronous and rapid growth, the length of the foreskin always exceeds the length of the penis, it will obscure the glans, obscure the urethra, resulting in local residual urine, secretions and cause foreskin scale, urine scale, stimulating patients with pain in the urethra, glans pain, inflammation, and even premature ejaculation caused by glans over-sensitivity and other diseases. Long-term stimulation of foreskin scale can also cause an increase in the incidence of penile cancer. For patients who suffer from circumcision and have recurrent infections or fail to do well in personal hygiene, circumcision is recommended.