1.What is occult penis, buried penis? The occult penis is a common congenital developmental abnormality and deformity, which is essentially different from pediatric circumcision or prepuce. Generally the foreskin of the penis is often wrapped around the head of the penis when the baby boy is born. With the development of the spongy body of the penis, many children are able to turn up the head of the penis on their own at the age of 3-4 years old and expose it. In 1919, Keyes first described buried penis, which refers to a normal penis buried by excess fat in front of the pubic bone. 1985, Klauber, 1986, Maisels et al. described an abnormal fascial band between the penis and Scarpar’s fascia. There are abnormal fleshy cords between the penis and Scarpar’s fascia pulling on the penis, resulting in varying degrees of penile tethering. The occluded penile body is often retracted inside the body, with only the small pointed foreskin protruding from the outside. If the skin of the penis is squeezed inward with the hand, the penis body will be revealed, but once the hand is released, the penis body retracts again. Currently the concepts of occult penis and buried penis are often confused. Although the appearance of occult penis is similar to that of circumcision, it is two completely different diseases from circumcision and prepuce because the outer skin of occult penis is not too long but too short, and its penis body is not small but normal. Therefore, circumcision cannot be done as in the case of circumcised patients. 2. Possible causes of occult penis (1) excessive obesity and fat buried in the perineum; (2) no adhesion between the penile skin and the penile corpus cavernosum, resulting in the penile corpus cavernosum being unsupported and retracted inside the body; (3) penile skin is too short, the prepuce cavity is too small, and abnormal flesh membrane pulling makes the penis hidden under the perineum skin; 3. How to diagnose what is occult penis? For obese children whose penile skin is pushed toward the root of the penis and can feel the normal penile body, occult penis should be considered first; if the foreskin is pushed toward the root of the penis and the outer plate of the foreskin is seen to be continuous in the lower abdominal wall, or the penile skin is deficient during the period, and, there is no obvious fat accumulation at the root of the penis, then buried penis should be considered. 4.What kind of patients need surgery to correct occult penis? If the patient has a severe occult penis with recurrent glans penis, surgery should be performed as early as possible. If not treated as early as possible, the development of the penis will be affected. However, a significant proportion of children with occult penis will heal themselves as the penis develops with age. If the occult penis still exists after the second growth spurt of the penis (12 to 14 years old), timely surgical intervention is needed to correct the condition. Surgery is mainly performed by removing the abnormally stretched fleshy tissue of the penile penis body, loosening and lengthening the penile skin, and reattaching the penile foreskin to the penile body for the purpose of correcting occult penis. For those who have thick fat accumulation on the pubic bone, some of the fatty tissue can also be removed through surgery or fat aspiration. 5.Post-operative precautions for occult penis In the early post-operative period, try to avoid walking, cycling, sexual stimulation, etc. Do not hold urine to avoid repeated erection of the penis affecting the healing of the wound; some patients will have local discomfort of the foreskin after surgery, scratching should be prohibited, and should be scrubbed clean after urination and defecation to prevent local infection; appropriate sedatives can be taken before bed after surgery, and some estrogen can be taken orally for a short period of time to avoid pain and bleeding caused by penile erection. Bleeding.