Case Presentation: A 57-year-old man presented with three weeks of palpable petechial rash, abdominal pain, polyarthralgia and edema. The rash started as “red dots” on his abdomen and spread throughout his body. On exam, he exhibited diffuse palpable purpura with blistering to his bilateral feet. Initial work up was notable for creatinine (Cr) 3.30 from [...]