A patient with a known biopsy of polyarteritis nodosa diagnosis presented with cyclic fevers, acute kidney injury, and progression of rash from macular to pustular, worsening despite being on antibiotics, without evidence of infection on multiple cultures. The patient had a pathological diagnosis from a skin biopsy of acute generalized exanthematous pustulosis syndrome, with a total resolution of rash, fevers, and acute kidney injury on treatment with pulse steroids.