The hard nodular material can be felt on the outer side of the testicle in the clinic is usually seen in four kinds of diseases: First, epididymitis, such patients usually have the experience of cold, fever and local trauma to the scrotum, and the patient is accompanied by fever and localized severe pain in the testicle; Second, varicocele, in addition to the hard nodular material that can be felt on the surface of the body, but also can be seen on the surface of the scrotum there is a large number of earthworm-shaped vascular tissue; Third, testicular or epididymal cysts, patients often have no obvious symptoms; Fourth, syringomyelia, around the testicle or epididymal usually can be felt by hand with a watery fluidity inside the nodule. Testicular or epididymal cysts, patients often have no obvious symptoms; four, syringomyelia, in the testicles or epididymis around the hand can usually feel the cystic and inside the watery fluidity of the hard knot. In addition to these cases, patients should go to the hospital immediately to do scrotal ultrasound, because only ultrasound can determine the nature of the disease and the site of the disease, according to the results of the ultrasound test before deciding on further treatment measures.