I have a lump forming on my lower leg on my shin above my ankle.

It is quite large Its not rock hard, but it feels nobbly (if that makes sense) when I touch it. it is about the size (roundness), of half a tennis ball, but smaller if you know what I mean.

I am so, so terrified to go to the drs to find out what this thing is.. all I can think of is cancer and usually cancer in the leg means its secondary cancer from something else I have had this lump a few months now, there is no pain associated with it, but I have noticed its getting bigger

anyone have anything like this??