Patient question: How is this disease treated? What is the best age for treatment? What is the effect after treatment? Deng Yongji, Department of Urology, Nanjing Children’s Hospital, Nanjing Medical University, replied: 1. occult penis does not affect penile development; 2. surgery only improves the appearance of the penis and does not help the development of the penis; 3. occult penis is not suitable for simple circumcision due to the difficulty of foreskin flap, if the foreskin is still difficult to flap before school age, surgery is recommended.