Hello, thanks for using health care magic.
indicates an irritation of the nerve
supplying the underlying area.
Following the accident, it is likely that the nerves supplying the underlying region have been affected by the trauma.
This could also occur if there is ischemia
of the region which could also lead to necrosis including osteonecrosis
. Necrosis will occur if the blood vessels are supplying the region have been damaged. The evolution to necrosis starts with color change from normal skin color through blue to black discoloration.
You could get your arterial pulses get tested by the doctor to see if there is till blood supply. If blood supply has been altered, vascular surgery
could help else necrosis will set in.
Best regards and hope this helps you.