The cause of the onset of occult penis is unknown, but it is associated with penile hypoplasia and obesity. The main manifestation is obesity, the fat of the pubic mound is 5-7 cm thick, the penis is completely submerged under the skin and fat, and the glans is invisible. Externally, only the foreskin of the penis can be seen, and sometimes there is narrow foreskin, the glans can not be pulled out by force. In this case, the child is pessimistic and has no self-confidence, and the adult has problems with urination and sexual intercourse. In addition, the dirt inside the foreskin is not cleaned, often causing urethritis, anterior glanditis, etc. The hidden penis should be treated early, and children can be treated at the age of 6. Currently, the main surgical methods are penile corpus cavernosum release and lengthening, fixation of different parts of the skin, and removal of excessive fat. The surgery is less invasive and can be done in a 4-day hospital stay for children and on an outpatient basis for adults. It is recommended that patients with anaphylactic penis be treated as early as possible, so as not to delay the treatment, which affects the development is a big deal, and affects several generations.