allergic reaction to vitamin b12 injection Cutaneous subcutaneous K1: A case report and review of literature Vitamin B12 Injection site red

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These observations are exploratory and not conclusive

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Apply light pressure after injection for 15-20 seconds to minimize bruising

If the full dose was delivered (the plunger is fully depressed), the needle was in the subcutaneous tissue (not too shallow or too deep), and no significant amount of liquid leaked from the injection site, the injection was performed correctly