Hi, thanks for writing to HCM.
From the description, it seems that you have developed a
soft tissue hematoma ( blood clot ) at the site of
injury.
Generally, this resolves spontaneously within 3 weeks (maximum).
But in case if you are a Diabetic person or if the size of the swelling is increasing (despite hot fomentation) with associated fever and
severe pain, then there is likelihood of infection.
Consult your treating doctor in such a case.
Hope this information is helpful. Good day