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An inguinal hernia can cause swelling in the scrotum. The blood vessels to the testicles pass though the inguinal canal. The pressure in the inguinal canal from a hernia can compress the veins and cause swelling in the scrotum.
An infection of the testicle or of the tube that drains the testicle could also be a cause of swelling of the scrotum, and also could be the cause of a low grade fever.
The Cipro, itself, is not reported to cause swelling of the scrotum.
The fact that you are not having any pain is reassuring that the most serious condition that can cause swelling is not present. If the testicle twists on itself, called testicular torsion, it can interfere with blood supply to the testicle, and will cause swelling and significant pain. If this happens, it would typically need emergency care, but as long as you are not having pain, there is no reason to be concerned that this is present. However, if pain develops, it would be important to be seen.
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