There is a small thread on the wound of cryptorchidism surgery, which is a suture used to close the surgical incision. Generally, there is no need to worry too much about it, and the thread can be gradually absorbed or removed after the wound has healed. Cryptorchidism is a condition in which the testicle fails to descend to the scrotum in the normal course of development, which may lead to infertility or malignant changes. Surgery can be performed to immobilize the testicle in the scrotum to minimize spermatogenic damage to the testicle and the possibility of malignant changes. A small thread on the wound after cryptorchid surgery is usually a suture used to close the incision and is usually not a cause for undue concern. If the patient uses absorbable thread, most patients will absorb the thread in about half a month, and if non-attractive thread is used, the suture can be removed after 1~2 weeks after the operation. If the absorbable thread has not disappeared for a long time, you should also seek medical advice for manual removal. In your daily life, you should pay attention to hygiene and avoid the incision site from being exposed to water in order to avoid infection.