SHOULD I BE CONCERNED ABOUT A RATHER LARGE HEMATOMA ON MY LEG

I HAVE CONCERNS ABOUT CLOTTING ...I HAVE A RATHER LARGE HEMATOMA THAT HAS NEVER DISSOLVED ON MY RIGHT LEG JUST BELOW MY KNEE** SUBSTAINED 4 YRS AGO AFTER A CAR ACCIDENT***..WOULD I HAVE A HIGHER THAN NORMAL NORMAL RISK FOR CLOTTING AFTER SURGERY?????

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