Our expert says:
That must have been very painful! It sounds as if a superficial vein was injured and this is the black bruising that you see. If the bump is pulsating/throbbing at all or growing bigger, and there is new black or red discolouration of the skin, rather go back to the doctor. Otherwise, the bump is probably a hematoma that will resolve on its own, and this can take weeks to months. Please, if you are worried at all, rather go to the doctor. Good luck and I hope that you feel better soon.
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