<s>[INST] Hi I have a small pea size lump in my side above left kidney area, its generating a soreness type pain and aches. I have had it for 5 wks and when first appeared I didnt 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. [/INST] Hi and welcome to Chat Doctor, thank you for your query. If you can feel it under the skin then this is not originating from kidney probably and this would be only benign subcutaneous lesion. It can be surgically removed under local anesthesia and then sent to histologic analysis. Also, you can do ultrasound and needle biopsy to evaluate this lump. In every case i don't think this is related to your malignant previous disease. Wish you good health. Regards. </s>