The boy’s scrotum is flaccid and soft. It is recommended to go to the hospital for further examination to clarify the specific causes: 1. Cryptorchidism, there is no testicle in the scrotum, so the scrotum is flaccid and soft. When touched by hand, the scrotum is empty and the testicles are not touched, which are located in the groin or abdominal cavity. Ultrasound examination is needed to confirm the diagnosis of cryptorchidism. 2. Varicocele, the varicose veins of the spermatic cord fall into the scrotum, causing the scrotal skin to become flaccid over time. Externally, the scrotum on the side of varicocele increases in size, the epidermis is loose, and the varicose vascular tissue can be touched by hand. Ultrasound examination of the spermatic vessels is needed to rule out the presence of varicocele. 3. Testicular sphincter effusion, which can appear as increased fluid in the scrotum, manifested by an enlarged, soft and flaccid scrotum, requires ultrasound examination of the testicles to confirm the diagnosis of the presence of effusion.