Hi, thanks for writing to HCM.
As per your description, you could have sustained a soft tissue hematoma
. This usually resolves within 2 weeks with simple limb elevation and some ice packing over it. But in certain situations (diabetic patients),it may get infected and causes troubles which may need surgical drainage
So, if it is not resolving over a period of time, consult a doctor
and follow his advice accordingly. Hope this helps