A hard lump in the scrotum may be a testicular or epididymal cyst, an inflammatory mass, or even a tumor, which needs to be clarified through relevant examinations. 1. Cysts: testicular or epididymal cysts can lead to lumps in the scrotum, which usually have a smooth surface, insignificant pressure pain, and clear boundaries. 2. Inflammatory mass: inflammatory mass is usually suffered before epididymitis, etc., after the inflammation is cured, the local fibrous mass is left, the texture is hard. 3. Tumor: Testicular tumors can also have lumps, the boundary between the lump and the testicle is not clear, and the testicle volume increases with a sense of falling. Overall, hard lumps found in the scrotum, need to pay attention to, go to the hospital in a timely manner to check, clear causes for targeted treatment.