A ball-like object in the lower part of the scrotum can be considered as a lesion such as epididymitis, epididymal cyst or testicular tumor. 1. Epididymitis: Epididymis can be secondary infection due to urinary tract infection and other reasons, then cause inflammatory reaction. When epididymitis occurs, there may be pain and swelling in the epididymis area, which may become hard or appear as nodules, and the scrotum may have a feeling of falling and swelling. 2. Epididymal cyst: the lesion is cystic, which can cause slight pain, scrotum may have a feeling of falling, and a cystic round and smooth swelling can be touched in the epididymis. 3. Testicular tumor: generally rare, may be related to cryptorchidism, its typical performance is a painless solitary mass in the scrotum of the affected side, with the gradual increase of the tumor, the testicle on the diseased side is gradually heavy and hard, there may be a dull pain, and the transillumination test is negative. If there is a lump in the lower part of the scrotum, it is recommended to consult a doctor in time, according to the relevant examination to clarify the diagnosis, and then treat the cause and symptoms.