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A 65-year-old male presents to the ER with a new onset rash and blood in his urine. The ER doc is worried about an allergic reaction and on chem 7 finds that the patient’s creatinine is 6.5 mg/dl. The patient has been a diabetic for over 20 years and had been diagnosed with cellulitis of his left foot a week ago by a family practice physician who gave him antibiotics. A skin biopsy of the new onset rash during this hospitalization shows a leukocytoclastic vasculitis with IgA deposition. A kidney biopsy is requested. The kidney biopsy shows nodular diabetic glomerulosclerosis...