Small bumps on the testicles are recommended to go to the hospital for examination to clarify the possible causes. Firstly, inflammatory nodules in the testicles are often secondary to orchitis and can appear as local hard or tough nodules in the testicles, with swelling and pain in the acute stage, but there are usually no conscious symptoms in the chronic stage. Secondly, epididymal nodules are commonly found in epididymitis or epididymal tuberculosis, which can appear as hard or tough local lumps. In the acute stage, it may be accompanied by swelling and pain, while in the chronic stage, there is usually no symptom, if it is tuberculosis, the epididymal body may become hard and the vas deferens may change in a bead-like manner. Thirdly, testicular tumor may appear as localized hard nodules in the testicle, and then gradually expand in volume, size and scope, and diffuse to the whole testicle with hardened texture and increased volume, etc. Testicular tumor index test and testicular CT test are needed to further confirm the diagnosis.