A bag in the scrotum may be associated with epididymal cysts, testicular or epididymal tumors, sebaceous cysts, and other causes, which need to be further differentiated and diagnosed by a doctor. 1. Epididymal cysts: most patients have no obvious symptoms and can palpate a bag in the scrotum. 2. Testicular or epididymal tumor: a single painless mass can be touched in the scrotum on the affected side, and symptoms such as dull pain in the scrotum and lower abdominal swelling and discomfort can occur. 3. Sebaceous cysts: If the sebaceous gland secretion is blocked under the opening of the gland, a bulging scrotum may appear. It is recommended that people with a bag in the scrotum go to a regular hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor, so as not to delay the disease to bring adverse effects on the body.