Hello, my name is Dr.Dorina Gurabardhi. I understand your concern.
A knee lump can represent :
-a
joint deformity due to a chronic inflammatory condition such as
arthritis -deformity that arises following any kind of
injury to the joint
-infections
Some advices that I can give to you are :
-Do not squeeze, scratch, drain, open (lance), or puncture the lump.
-Keep the area clean by washing the lump and surrounding skin well with an antibacterial soap.
-Apply warm, wet washcloths to the lump for 20 to 30 minutes, 3 to 4 times a day.
Hope my answer was helpful, if you have any other questions I'll be glad to help, thanks!