Epididymal cyst, a fluid-filled sac that grows in the epididymis. Epididymis, in the scrotum (surrounds the back and top of the testicle) is a tube about 20 feet long where the sperm matures as it passes through. Epididymal cyst vary in size. are typically not painful, unless if they grow too large.

Usually a pain relief medication will be given, and if it is an infected cyst, treatment options can include antibiotics and drainage. At some occasion, the cyst may need to be surgically removed.