A hydrocele is a type of swelling in the scrotum, which is the pouch of skin that holds the testicles. It occurs when fluid collects in the thin sac that surrounds a testicle. Hydroceles are common in newborns and often go away without treatment by age 1. However, older children and adults can also get a hydrocele due to an injury within the scrotum or other health problems. The main symptom of a hydrocele is swelling, which may cause discomfort or pain. Hydroceles can be diagnosed by a healthcare provider who will ask questions about symptoms and perform a physical examination. Although hydroceles tend to be fairly harmless in most patients, they can be linked with a health problem that can cause serious issues, such as infection or tumor. Treatment for hydroceles is usually not necessary, but surgery may be required if the hydrocele doesnt go away on its own or causes discomfort.