Only one testicle means cryptorchidism. Cryptorchidism refers to the absence of a testicle on one or both sides of the scrotum. In this case, it is recommended to go to the hospital for relevant examinations to clarify the diagnosis, and ultrasound examination of the scrotum and ultrasound examination of the inguinal region can be done to clarify the diagnosis. Scrotal ultrasound examination is mainly to clarify whether the testicles exist, and inguinal ultrasound examination is mainly to clarify whether the missing testicles exist in the inguinal region. For patients with cryptorchidism, they need to choose surgery for treatment in time because the possibility of cryptorchidism becoming cancerous is relatively high and may also affect the fertility of patients.