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Ouch ... it must really hurts.
Do take note and monitor to ensure that the wound is fine.
Ensure that there is no infection or pus, else pls bring to polyclinic or gp to review.
Try to keep the area clean and dry.
Don't place a plaster over it. You can call up your PD to check if it "looks" normal and whether there is anything you need to do about it.