Medical explainer on Instagram: "A hydrocele is fluid buildup in the sac around the testicle, known as the scrotum. This fluid causes the testicles to swell in men or those assigned male at birth. Hydroceles are more common in babies and infants but can develop at any age. Typically, hydroceles are not painful and don't pose a serious risk. Hydroceles often disappear on their own in infants within the first year of life. Babies can develop hydroceles before they are born. In older individuals, h