It's necrotizing fasciitis. Usually caused by multiple different bacteria, including strep and staph (you'd have to culture it to know for sure) but generally only in immunocompromised patients with comorbidities of beetus or cancer etc. Now we can't say for sure that it has beetus but you know what they say about hoofbeats. ETA: the healthcare industry didn't "invent" MRSA they just increased the pace of evolution.