(Click the link to comment and to vote – voting not working through email, sorry!)

You are seeing a 17 year old girl that works in a pet store, where she is sometimes scratched by the animals there. She felt fine that morning, but noted malaise and low-grade fever in the afternoon, and pain in her lower right shin. She presents to the ED with temp 38.5, HR 140, RR 20, BP 95/60. She has a 4cm x 4cm non-well demarcated area of red-purple discoloration on her lower right shin, with mild edema. On close inspection there are a few small bullae in the area of discoloration. On palpation of the area, it is warm, extremely, tender, and has crepitus. 

As you obtain vascular access and give broad spectrum IV antibiotics, what else should you be doing?