The andrology expert replied that the foreskin is too long, which means that the adult penis head is completely wrapped by the foreskin, and only when the penis is upside down or erect can the penis head be exposed. Phimosis and redundant prepuce are two common malformations in men. Their harm is easy to cause penis inflammation, scale accumulation, sometimes adhesion, pain during sexual intercourse or lack of sexual pleasure, and some even induce foreskin stones or penile cancer. Therefore, phimosis and redundant prepuce should be operated as soon as possible. It can protect glans from trauma and insect bite, and keep glans smooth, delicate and sensitive. If the foreskin still covers the urethral orifice when the penis is erect, circumcision is needed. Whether the excision is too much depends on the difference between the foreskin after erection and normal needs. It is impossible to judge whether the operation failed by looking at the skin color alone. The outer skin of male penis is slightly black, which is due to black pigmentation. After circumcision, if there is no black pigmentation inside, pink may appear. After a long time, this part of the skin will get darker and darker, so don't worry. Some people will have post-erection pain, penile curvature, sexual pain, and even fear or avoid sex life after circumcision. This is because the foreskin is too long, and you should go to plastic surgery for remedial surgery. However, the current circumcision technology is quite mature, and regular hospitals usually don't have too many excision operations.