I have a lump thats very mobile it almost feels like a hard rubber?

I can move it side to side i went two different doctors and both have said that it is 99 percent lipoma however they haven't done any xrays or anything i also have been having so much random fevers which im worried about the lump is near my ribs almost like underneath my breast
I have a lump thats very mobile it almost feels like a hard rubber?
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