I have a lump on my back its hard and painful. I get it when I stand long period of times. I'm not sure I have had a cordizone shot in it. Didn't help?

X-ray/MRI. Painful persistent lump should be further evaluated with imaging if not already done. This will help establish a diagnosis and weather this is something that should be removed if symptoms persist. Would not recommend any further invasive procedures until it is established what the mass is.