<prompt> Answer this question truthfullyWhat exactly is Pyomyositis and how is it categorized?  <response>: <reason> Pyomyositis may be classified according to the International Classification of Diseases-10 ICD-10 into: M60.0 Infectious myositis, Tropical pyomyositis optionally, B95-B97 to indicate the infectious agent; B95.6 for Staphylococcus aureusBased on prognosis, pyomyositis is classified into three stages:Invasive stage Purulent or suppurative stage Late or septic stage 