How to tell if i'm developing gangrene?

Dry or wet?: Either is fairly obvious and requires treatment. Wet unusually associated with progressive necrosis/death of tissues with a foul odor and occasionally has air in fhe tissues characterized by a crunchy sound when pressed. If usually occurs in immunocompromised patients in areas of compromised blood supply. The area is surrounded by increased redness. Dry gangrene tends to exhibit black tissue.

Fever: Redness and rapid progression if you think you have it go to an er.