Case Presentation: A 31-year-old male with no significant past medical history presented with fever, chills, night sweats, and rash. One week prior, he underwent incision and drainage of a perirectal abscess and was started on a 7-day course of trimethoprim/sulfamethoxazole (TMP-SMX). On the second day following the procedure, he developed fevers, chills, night sweats, and [...]