The soft ball of soybean size felt on the side of the epididymis is considered to be epididymal cyst, testicular cyst, testicular dermoid cyst and so on. 1. Epididymal cyst: epididymal cyst is a cystic disease within the scrotum, is a more common male disease, semen stagnation will cause epididymal cystic mass, most common in the head of the epididymis to a single common, usually no obvious symptoms. 2. Testicular cyst: this disease is a cystic benign lesion in the scrotum, the onset of the location in the head of the testicles, inflammation and infection or trauma will cause some of the ducts to be blocked, which will cause the accumulation of fluid in the testicles, the formation of cystic lesions. It is highly prevalent in patients with a history of orchitis and testicular trauma. 3. Testicular dermoid cyst: during fetal development, the tissues of the skin are not completely separated from other tissues and organs, but are adhered together, in which case some of the tissues will be buried under the skin and grow abnormally, resulting in dermoid cyst. The soft ball of soybean size touched on the side of epididymis cannot be diagnosed directly by symptoms alone, and it should be consulted in time, combined with clinical symptoms and examination to confirm the diagnosis and correct treatment.