Cryptorchidism is a disease that is mainly diagnosed by the appearance of the patient’s penis, and generally does not require imaging tests and blood tests. The diagnostic criteria for cryptorchid penis are: ① poor penile disclosure, short appearance; ② normal development of the penile body is hidden under the skin; ③ push back the skin at the root of the penis with your hand to see the normal penile body is exposed, and then the penile body retracts rapidly after release; ④ exclude buried penis, webbed penis, bound penis, small penis, and other penile deformities. Concealed penis is due to the underdevelopment of the distal urogenital sinus, which normally extends to the genital nodes during embryonic period, and the abnormal development of the penile skin fascia and fleshy membrane, which is poorly ductile, impedes the stretching of the penis and fixes the male genitalia right below the pubic symphysis. The male genitalia are usually not deformed but merely hidden in the skin tissue, usually with thickening of the prepubic skin and fat tissue. This disease is difficult to cure through medication and other conservative treatments, and surgery is recommended with a good prognosis. Consult your physician for specific advice.