Painless oval lump above right knee. firm and doesn't seem to move. no discomfort or recent injury. near former unicameral bone cyst. ?

MRI: This situation needs an MRI for proper diagnosis.If closeto the joint it could be a plain cyst of the meniscus,however above the joint multiple possibilities

Without the benefit: of an examination, a cyst or lipoma is likely. However an examination is needed especially if the lump is non movable,

More information ndd: You probably have an idea whether it's in the skin layer or deeper. It sounds deeper than the skin (doesn't move). Since firm, it's prob. not a benign fat tumor (lipoma). In that case it suggests either a cyst (fluid-filled) or a fibroma (think of as overgrowth of scar tissue), both also benign. However this is something you may want to have your doctor, NP or PA look at sometime.