DefinitionBy Mayo Clinic staff
A hydrocele (HI-droe-seal) is a fluid-filled sac surrounding a testicle that results in swelling of the scrotum, the loose bag of skin underneath the penis. They are common in newborns, but most hydroceles disappear without treatment within the first year of life. Older boys and adult men can develop a hydrocele due to inflammation or injury within the scrotum.
A hydrocele usually isn't painful. Typically not harmful, a hydrocele may not need any treatment. However, if you have scrotal swelling, see your doctor to rule out other causes.
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