I am so sorry you have to go through this...a staph infection that turned into MRSA was how I aquired RSD. Take a pen and trace where the red end, that way if the redness spreads beyond the pen marks, you'll know if it's spreading. Keep a good eye on it, because it can spread within MINUTES, if it decides to. Just thinking about the pain of my infection makes me sick at my stomach.
Hope you feel better soon.