If there is a hard lump in the testicle without any pain, it is recommended to go to the hospital for examination to clarify the specific causes: 1. The formation of local scar nodules secondary to orchitis or epididymitis. In this case, there can be a local hard lump without any pain, the boundary of the hard lump is clear and there is no local swelling, no scrotal skin redness or swelling, and other reactions. The testicular tumor may appear as a local hard mass, and the sclerosis may expand over time and eventually diffuse to the whole testicle. The testicle may increase in size and harden in texture, and it may feel like touching a stone when touched by hand. When the volume is larger, it can produce a localized feeling of swelling, and may also be accompanied by a history of enlarged and painful lymph nodes in the groin area. CT and tumor index tests are needed to further confirm the diagnosis.