You are correct. Ecthyma gangrenosum (EG) is a rare cutaneous infection often caused by Pseudomonas aeruginosa, although other bacteria, fungi, and viruses can be responsible. A skin swab grew Pseudomonas aeruginosa; blood cultures were negative. EG usually occurs in children with known immunocompromise, but sometimes it also occurs in healthy children, as indicative of sepsis or immunodeficiency. Serum immunoglobulin values checked after resolution of infection in this pt turned out normal. Fever ceased within 24 hrs after intravenous antibiotic therapy w/ piperacillin-tazobactam and tobramycin, and the lesion quickly improved, leaving a residual scar.