A testicular cyst is a fluid-filled sac that forms in or on the testicle. These cysts are usually benign, meaning they are not cancerous, and often do not cause any symptoms. They can vary in size and may be discovered during a routine physical examination or imaging tests. Most testicular cysts do not require treatment unless they cause discomfort or other issues. In such cases, a healthcare provider may recommend monitoring the cyst or, in rare instances, surgical removal. Regular check-ups are important to ensure that the cyst does not change or lead to complications.