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Definition
By Mayo Clinic staffA hydrocele is a fluid-filled sac surrounding a testicle that results in swelling of the scrotum, the loose bag of skin underneath the penis. About one in 10 male infants has a hydrocele at birth, but most hydroceles disappear without treatment within the first year of life. Additionally, men — usually older than 40 — can develop a hydrocele due to inflammation or injury within the scrotum.
Hydroceles usually aren't painful. Typically not harmful, hydroceles may require no treatment. However, if you have scrotal swelling, see your doctor to rule out other causes, such as testicular cancer or other conditions.
Symptoms
