Spermatocele

A spermatocele normally has clear or milky fluid in it, and it might also have sperm in it. Spermatoceles are usually not painful or dangerous, and people often encounter them by accident during physical tests or self-exams. Spermatoceles are thought to be caused by a blockage in one of the sperm-carrying tubes in the epididymis, although the specific cause is still not known.
Most spermatoceles don't affect fertility or need treatment.

But if a spermatocele gets too big, it can make the affected testicle feel heavy, full, or painful. A physical exam and an ultrasound are the main ways to diagnose it. This procedure helps tell it apart from other testicular problems. Most of the time, treatment is only needed if there is pain or a lot of discomfort. The two treatment options are surgery to remove the problem and aspiration, which is less commonly used. Spermatoceles are common in men of all ages, but most often occur between 20 and 50. They are not malignant and do not raise the risk of testicular cancer.