Our expert says:
There could be a collection of fluid due to inflammation around the testis, or it could be blood ( usually the colourof the testis will be bluish and the skin will feel warm and look reddish) BUT if it feels as if the one testis is higher than the other, and the cord feels thickened, or if it becomes very painful with nausea and vomiting, please see a doctor immediately. Sometimes the testis can twist on itself during an injury and then it cuts off the blood flow to the testis, causing gangrene of the testis. Other problems with blunt trauma could be cuts of the testis cover, or rupture of the testis. Keep an eye on this and if it worsens, rather play it safe and see your doctor so that they can organize a sonar to exclude serious damage.
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