A bruise after an intramuscular injection is not abnormal, It can take a while for it to completely heal. Eight days seems a little long but when exactly did the bruise appear in relation to the tetanus shot? Is the bruise turning greenish/yellowish and decreasing in size-all signs it is healing? Did you have any other injury to the area after the tetanus shot? If concerned, see your doctor.
Answered 12/26/2021
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This is likely a booster dose for you and the bruise probably reflect the reaction of your existing antibodies with the newly delivered toxoid. If it is getting better, let time heal the lesion.
Answered 12/27/2021
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