It is not too late to have circumcision at eighteen. Phimosis refers to the narrowness of the foreskin, which cannot be turned up to reveal the head of the penis. Phimosis can be categorized into congenital phimosis and acquired phimosis. For patients with phimosis, because the foreskin can not be turned out to clean, there will be a large amount of foreskin scale gathered inside the foreskin, and will even be discharged from the opening of the foreskin, which will easily lead to cancer of the glans may suffer from glansitis. Adult circumcised persons should undergo surgical treatment as soon as possible to solve the existing circumcision situation and thoroughly clean the glans to prevent inflammation. This is why circumcised individuals at the age of eighteen should have surgery as soon as possible. Eighteen-year-old patients who still have a prepuce should choose a targeted surgical treatment under the operation of a specialized doctor.