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Have you had a tetanus shot recently?
You may have sustained more damage from the shaking, as well as the pinching of the original bite than you originally expected. This can cause additional pain and bruising, not to mention swelling. I would suggest you get it looked at by your medical provider, and do get a tetanus shot if it has been more than about 5 years since your last one. Guidelines call for every 10 years, but why take a chance?