It might be related to the vasectomy. Where there are tubes with closed ends in the body, the risk of infection is much greater. With a vasectomy, you now have two ends where bacteria can harbor and cause problems. There can be other complications associated with vasetomies.
Of course, there is a good chance it is a mild case of epididymitis or something else. If it does not improve pretty soon, he should see a doctor about it.
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