Hi,Dear,Welcome with your query to HCM.
Studied your query in full depth of its details.Reviewed it in context of your health concerns.
Based On the facts, You mostly seem to suffer from-
Lipoma of the below knee region.As this fatty lump is there for 12 yrs and now lately seems to have grown out of proportion. and is noticeable through the clothes.Other causes of
arthritis with Synovial thickening needs to be ruled if you are very
obese,as this could cause arthritis with synovial grannulation / thickening.
CT Scan study of the knee would fix the diagnosis in your case.
Hope that ,This reply would help you to plan further treatment soon with your treating doctors.Best of Luck and early recovery.
Welcome any further query in this regard,which would be replied in next
session.
Good Day!!
Dr.Savaskar M.N.
Senior Surgical Specialist