if it becomes moist and weepy then it may be a sign of spreading infection for sure.
But it may also be a sign of returning vascularity depending on many things.
In infection it is true to make a dics of your self ( same for a Fracture actually)
Discolouration inflamation (heat swelling redness and exudate) circulation and sensation ( pain numbness etc)
I in saying this would still treat area as viable until proven otherwise until a point.
A simple cut will tell you if tissue sub integimentry is viable.
Another thing you could try is QID chlorhex or saline soaks but again risk as adding mositure to potentially non viable tissue
Is there an odour at all?
Navarre