I haven't looked up any of your other medications at all so I can't say one way or another if they can cause kidney problems, but I do know that there are significant warnings for scleroderma patients against taking prednisolone.
Please see our page on:Glucocorticoids, Steroids (Prednisone) Warnings for Scleroderma, where it says (among other things), "Corticosteroids strongly increase the short-term risk of developing scleroderma renal crisis! It also causes a 70 percent increased risk of developing pneumonia."
You would certainly want to print that page off and discuss it with your scleroderma expert, since you are already experiencing kidney disease. Also ask your pharmacist if any of the other meds you are on can affect kidney function.
At the very least, you and your doctors should be completely aware of the meds you are taking that might be worsening your kidney function and discuss the risk/benefit ratio given your particular health issues.
I want to add, I know you wouldn't even dream of it, but for others who might stumble across this thread, never ever never stop taking steroids without the consent and specific tapering advice of your physician, because reducing or stopping steroids in the wrong way can cause very serious health problems.