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It is a very common symptom/side effect of most injections to have soreness and/or tenderness around the injection site for a few days after the injection.
However, if this soreness persists for more than 3-5 days, or if the skin around the site becomes inflamed, red or abnormal in appearance, then this is something that needs to be assessed by a medical professional right away! If he has had a sore around his injection site for over three months, then this is not normal and he needs to get to a doctor right away, as the site may be infected. If you do not get the infection under control, then it can infiltrate the blood stream causing sepsis, which is very serious.
So please advise him to have it looked at by his doctor.
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