I'm 39,I had an MRI which showed a thickened bladder wall. I'm going to get a cystocopy this month. I also started getting an itchy rash all over my body 6months ago. I've seen a Dermatologist and a biopsy came back neg.,as well as testing neg.for MRSA. I saw an allergist and tested positive only to Nickel. He gave me a higher dose of Prednisone. It went away but came back after meds were gone. I'm on Macrobid for the urinary issue(also found WBC in urine), which also makes the rash decrease. I've tried different diets,different clothes,lotions,soaps,etc that would be typical causes for an allergy rash,but nothing helps. Is there any correlation between urinary/kidney problems and itchy skin/rashes?