Hi I have a small pea size lump in my side above left kidney area, it's generating a soreness type pain and aches. I have had it for 5 wks and when first appeared I didn't feel lump my first thoughts were I had probably pulled a muscle, but now I am a little worried, I have also had bladder cancer and had treatment in left tube to kidney, last check up by cystoscope was January and clear as it has been for the last 6 years.