Thanks for writing to us.
The huge lump that is persistent is likely to be due to the fibrosis
and scar tissue at the site of hematoma
formation. This swelling if it is painless is not worrisome. This will subside on its own in few weeks with regular hot fomentation.
I hope this information has been both informative and helpful for you. You can consult me again directly through my profile URL http://bit.ly/Dr-Praveen-Tayal
Dr. Praveen Tayal