HI,Welcome to HCM.
Based on the facts of your query,In My opinion You should Get Surgeon's Opinion,who after due deligence and check up would treat it acccordingly.
You seem to suffer from-Resolving Post-traumatic
Hematoma with
Cellulitis.
Delayed recovery indicates the hard edge of the step caused deep trauma at the dent spot.
Remedy-
Get the X-ray and USG done and rule out any
fracture from your doctor.
Rest
Anti-inflammatory x 1 week
Antibiotics if need be as per doctors advise
Hot Fomentation to reduce the Cellulitis
If no relief,your doctor would assess the lump and would plan for
-either a Wide Bore Needle Aspiration or Surgical
Drainage and excise the
remaining lump mass.
This would reduce your confusion and time for caring your 86 yrs old mom.
Hope this reply would help you
Welcome for any further query in this regard
Will appreciate writing your feedback review comments,to help the needy patients like you at HCM.
Good Day!!
Dr.Savaskar,
Senior Surgical Specialist
M.S.Genl-CVTS