What could purple, burning knot behind knee indicate?
Patient: I have a purple knot/bump behind my knee sorta hurts/burns felt like a bug bite when I first noticed it. Is more purple and noticable when I extend my leg. Just in case fyi...I was recently around someone who just found out they have mrsa but the bump I have isn t infected looking Doctor: Hello,  It could be bursitis or hematoma. Consult an orthopaedician and get evaluated. If there is diagnostic confusion, an MRI scan is required.  Hope I have answered your query. Let me know if I can assist you further.  Take care  Regards, Dr Shinas Hussain, General & Family Physician