1.Hinder the development of penis, resulting in short penis; 2.Susceptible to urinary tract infectious diseases, can cause circumcision, glansitis, urethritis, condyloma acuminata, gonorrhea, prostatitis, etc.; 3.Increase the incidence of penile cancer, the chronic stimulation of foreskin scale easily induces penile cancer, according to survey statistics, there are more people with foreskin and prepuce who suffer from penile cancer; 4.Increase the infection of various STDs and the possibility of relapse after treatment 5, easy to initiate masturbation, impotence, premature ejaculation, affect the quality of sexual life, serious cases may lead to the inability to have children; 6, bacteria and other infectious pathogens are often retained in the foreskin to form a foreskin scale, producing a foul smell, easy to infect the reproductive system diseases, easy to cause female gynecological diseases after marriage, such as vaginitis, cervicitis, cervical erosion, cervical cancer, etc.; 7, narrow foreskin mouth, forced up the foreskin easy to cause foreskin inlay, resulting in penile edema and even glans. This leads to penile edema and even glans necrosis.