The foreskin is too long and phimosis is very different. The foreskin is too long, that is, the foreskin completely covers the glans penis and the foreskin mouth is loose. The foreskin can be opened to expose the glans penis and the coronary sulcus. The phimosis means that the foreskin is long, but the foreskin mouth is too small to open the foreskin, exposing the glans penis and the coronary sulcus. For redundant prepuce and phimosis, some people suggest surgical treatment. Especially phimosis, surgical treatment should be given priority to. The phimosis can't be cleaned effectively, and the inner plate of the foreskin has secretions every day, which may lead to the formation of scale. Long-term stimulation of scales can easily lead to an increase in the incidence of penile cancer. If the scale is not cleaned in time, it will also lead to balanitis. It is suggested that phimosis must be operated.