It can cause pain: Injections can cause local hematomas, or "bruises" to the muscle. This happens especially if a person or child tenses the muscle during an injection. After an injection, it is best to use cool compresses to the area for the first 24 hours - then change to warm compresses (not too hot!). Also, gentle massage to the area helps resolve the swelling.
Answered 4/18/2019
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